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1237 lines
41 KiB
C++
1237 lines
41 KiB
C++
#pragma once
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#include "DayNum.h"
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#include "defines.h"
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#include "types.h"
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#include <ctime>
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#include <cassert>
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#include <string>
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#include <type_traits>
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#define DATE_LUT_MIN_YEAR 1925 /// 1925 since wast majority of timezones changed to 15-minute aligned offsets somewhere in 1924 or earlier.
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#define DATE_LUT_MAX_YEAR 2283 /// Last supported year (complete)
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#define DATE_LUT_YEARS (1 + DATE_LUT_MAX_YEAR - DATE_LUT_MIN_YEAR) /// Number of years in lookup table
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#define DATE_LUT_SIZE 0x20000
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#define DATE_LUT_MAX (0xFFFFFFFFU - 86400)
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#define DATE_LUT_MAX_DAY_NUM 0xFFFF
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/// A constant to add to time_t so every supported time point becomes non-negative and still has the same remainder of division by 3600.
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/// If we treat "remainder of division" operation in the sense of modular arithmetic (not like in C++).
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#define DATE_LUT_ADD ((1970 - DATE_LUT_MIN_YEAR) * 366 * 86400)
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#if defined(__PPC__)
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#if !__clang__
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#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
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#endif
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#endif
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/// Flags for toYearWeek() function.
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enum class WeekModeFlag : UInt8
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{
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MONDAY_FIRST = 1,
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YEAR = 2,
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FIRST_WEEKDAY = 4,
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NEWYEAR_DAY = 8
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};
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using YearWeek = std::pair<UInt16, UInt8>;
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/** Lookup table to conversion of time to date, and to month / year / day of week / day of month and so on.
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* First time was implemented for OLAPServer, that needed to do billions of such transformations.
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*/
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class DateLUTImpl
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{
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private:
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friend class DateLUT;
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explicit DateLUTImpl(const std::string & time_zone);
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DateLUTImpl(const DateLUTImpl &) = delete;
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DateLUTImpl & operator=(const DateLUTImpl &) = delete;
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DateLUTImpl(const DateLUTImpl &&) = delete;
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DateLUTImpl & operator=(const DateLUTImpl &&) = delete;
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// Normalized and bound-checked index of element in lut,
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// has to be a separate type to support overloading
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// TODO: make sure that any arithmetic on LUTIndex actually results in valid LUTIndex.
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STRONG_TYPEDEF(UInt32, LUTIndex)
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template <typename T>
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friend inline LUTIndex operator+(const LUTIndex & index, const T v)
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{
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return LUTIndex{(index.toUnderType() + UInt32(v)) & date_lut_mask};
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}
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template <typename T>
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friend inline LUTIndex operator+(const T v, const LUTIndex & index)
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{
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return LUTIndex{(v + index.toUnderType()) & date_lut_mask};
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}
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friend inline LUTIndex operator+(const LUTIndex & index, const LUTIndex & v)
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{
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return LUTIndex{(index.toUnderType() + v.toUnderType()) & date_lut_mask};
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}
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template <typename T>
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friend inline LUTIndex operator-(const LUTIndex & index, const T v)
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{
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return LUTIndex{(index.toUnderType() - UInt32(v)) & date_lut_mask};
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}
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template <typename T>
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friend inline LUTIndex operator-(const T v, const LUTIndex & index)
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{
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return LUTIndex{(v - index.toUnderType()) & date_lut_mask};
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}
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friend inline LUTIndex operator-(const LUTIndex & index, const LUTIndex & v)
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{
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return LUTIndex{(index.toUnderType() - v.toUnderType()) & date_lut_mask};
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}
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template <typename T>
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friend inline LUTIndex operator*(const LUTIndex & index, const T v)
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{
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return LUTIndex{(index.toUnderType() * UInt32(v)) & date_lut_mask};
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}
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template <typename T>
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friend inline LUTIndex operator*(const T v, const LUTIndex & index)
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{
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return LUTIndex{(v * index.toUnderType()) & date_lut_mask};
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}
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template <typename T>
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friend inline LUTIndex operator/(const LUTIndex & index, const T v)
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{
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return LUTIndex{(index.toUnderType() / UInt32(v)) & date_lut_mask};
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}
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template <typename T>
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friend inline LUTIndex operator/(const T v, const LUTIndex & index)
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{
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return LUTIndex{(UInt32(v) / index.toUnderType()) & date_lut_mask};
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}
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public:
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/// The order of fields matters for alignment and sizeof.
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struct Values
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{
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/// time_t at beginning of the day.
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Int64 date;
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/// Properties of the day.
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UInt16 year;
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UInt8 month;
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UInt8 day_of_month;
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UInt8 day_of_week;
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/// Total number of days in current month. Actually we can use separate table that is independent of time zone.
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/// But due to alignment, this field is totally zero cost.
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UInt8 days_in_month;
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/// For days, when offset from UTC was changed due to daylight saving time or permanent change, following values could be non zero.
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/// All in OffsetChangeFactor (15 minute) intervals.
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Int8 amount_of_offset_change_value; /// Usually -4 or 4, but look at Lord Howe Island. Multiply by OffsetChangeFactor
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UInt8 time_at_offset_change_value; /// In seconds from beginning of the day. Multiply by OffsetChangeFactor
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inline Int32 amount_of_offset_change() const
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{
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return static_cast<Int32>(amount_of_offset_change_value) * OffsetChangeFactor;
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}
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inline UInt32 time_at_offset_change() const
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{
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return static_cast<UInt32>(time_at_offset_change_value) * OffsetChangeFactor;
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}
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/// Since most of the modern timezones have a DST change aligned to 15 minutes, to save as much space as possible inside Value,
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/// we are dividing any offset change related value by this factor before setting it to Value,
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/// hence it has to be explicitly multiplied back by this factor before being used.
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static constexpr UInt16 OffsetChangeFactor = 900;
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};
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static_assert(sizeof(Values) == 16);
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private:
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/// Mask is all-ones to allow efficient protection against overflow.
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static constexpr UInt32 date_lut_mask = 0x1ffff;
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static_assert(date_lut_mask == DATE_LUT_SIZE - 1);
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/// Offset to epoch in days (ExtendedDayNum) of the first day in LUT.
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/// "epoch" is the Unix Epoch (starts at unix timestamp zero)
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static constexpr UInt32 daynum_offset_epoch = 16436;
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static_assert(daynum_offset_epoch == (1970 - DATE_LUT_MIN_YEAR) * 365 + (1970 - DATE_LUT_MIN_YEAR / 4 * 4) / 4);
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/// Lookup table is indexed by LUTIndex.
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/// Day nums are the same in all time zones. 1970-01-01 is 0 and so on.
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/// Table is relatively large, so better not to place the object on stack.
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/// In comparison to std::vector, plain array is cheaper by one indirection.
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Values lut[DATE_LUT_SIZE + 1];
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/// Year number after DATE_LUT_MIN_YEAR -> LUTIndex in lut for start of year.
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LUTIndex years_lut[DATE_LUT_YEARS];
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/// Year number after DATE_LUT_MIN_YEAR * month number starting at zero -> day num for first day of month
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LUTIndex years_months_lut[DATE_LUT_YEARS * 12];
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/// UTC offset at beginning of the Unix epoch. The same as unix timestamp of 1970-01-01 00:00:00 local time.
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time_t offset_at_start_of_epoch;
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/// UTC offset at the beginning of the first supported year.
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time_t offset_at_start_of_lut;
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bool offset_is_whole_number_of_hours_during_epoch;
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/// Time zone name.
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std::string time_zone;
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inline LUTIndex findIndex(time_t t) const
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{
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/// First guess.
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Int64 guess = (t / 86400) + daynum_offset_epoch;
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/// For negative time_t the integer division was rounded up, so the guess is offset by one.
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if (unlikely(t < 0))
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--guess;
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if (guess < 0)
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return LUTIndex(0);
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if (guess >= DATE_LUT_SIZE)
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return LUTIndex(DATE_LUT_SIZE - 1);
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/// UTC offset is from -12 to +14 in all known time zones. This requires checking only three indices.
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if (t >= lut[guess].date)
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{
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if (guess + 1 >= DATE_LUT_SIZE || t < lut[guess + 1].date)
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return LUTIndex(guess);
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return LUTIndex(guess + 1);
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}
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return LUTIndex(guess ? guess - 1 : 0);
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}
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inline LUTIndex toLUTIndex(DayNum d) const
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{
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return LUTIndex{(d + daynum_offset_epoch) & date_lut_mask};
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}
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inline LUTIndex toLUTIndex(ExtendedDayNum d) const
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{
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return LUTIndex{static_cast<UInt32>(d + daynum_offset_epoch) & date_lut_mask};
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}
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inline LUTIndex toLUTIndex(time_t t) const
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{
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return findIndex(t);
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}
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inline LUTIndex toLUTIndex(LUTIndex i) const
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{
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return i;
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}
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template <typename DateOrTime>
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inline const Values & find(DateOrTime v) const
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{
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return lut[toLUTIndex(v)];
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}
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template <typename T, typename Divisor>
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static inline T roundDown(T x, Divisor divisor)
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{
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static_assert(std::is_integral_v<T> && std::is_integral_v<Divisor>);
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assert(divisor > 0);
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if (likely(x >= 0))
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return x / divisor * divisor;
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/// Integer division for negative numbers rounds them towards zero (up).
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/// We will shift the number so it will be rounded towards -inf (down).
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return (x + 1 - divisor) / divisor * divisor;
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}
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public:
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const std::string & getTimeZone() const { return time_zone; }
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// Methods only for unit-testing, it makes very little sense to use it from user code.
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auto getOffsetAtStartOfEpoch() const { return offset_at_start_of_epoch; }
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auto getTimeOffsetAtStartOfLUT() const { return offset_at_start_of_lut; }
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/// All functions below are thread-safe; arguments are not checked.
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inline ExtendedDayNum toDayNum(ExtendedDayNum d) const
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{
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return d;
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}
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template <typename DateOrTime>
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inline ExtendedDayNum toDayNum(DateOrTime v) const
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{
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return ExtendedDayNum{static_cast<ExtendedDayNum::UnderlyingType>(toLUTIndex(v).toUnderType() - daynum_offset_epoch)};
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}
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/// Round down to start of monday.
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template <typename DateOrTime>
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inline time_t toFirstDayOfWeek(DateOrTime v) const
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{
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const LUTIndex i = toLUTIndex(v);
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return lut[i - (lut[i].day_of_week - 1)].date;
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}
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template <typename DateOrTime>
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inline ExtendedDayNum toFirstDayNumOfWeek(DateOrTime v) const
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{
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const LUTIndex i = toLUTIndex(v);
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return toDayNum(i - (lut[i].day_of_week - 1));
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}
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/// Round down to start of month.
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template <typename DateOrTime>
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inline time_t toFirstDayOfMonth(DateOrTime v) const
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{
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const LUTIndex i = toLUTIndex(v);
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return lut[i - (lut[i].day_of_month - 1)].date;
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}
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template <typename DateOrTime>
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inline ExtendedDayNum toFirstDayNumOfMonth(DateOrTime v) const
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{
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const LUTIndex i = toLUTIndex(v);
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return toDayNum(i - (lut[i].day_of_month - 1));
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}
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/// Round down to start of quarter.
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template <typename DateOrTime>
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inline ExtendedDayNum toFirstDayNumOfQuarter(DateOrTime v) const
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{
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return toDayNum(toFirstDayOfQuarterIndex(v));
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}
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template <typename DateOrTime>
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inline LUTIndex toFirstDayOfQuarterIndex(DateOrTime v) const
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{
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LUTIndex index = toLUTIndex(v);
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size_t month_inside_quarter = (lut[index].month - 1) % 3;
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index -= lut[index].day_of_month;
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while (month_inside_quarter)
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{
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index -= lut[index].day_of_month;
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--month_inside_quarter;
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}
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return index + 1;
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}
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template <typename DateOrTime>
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inline time_t toFirstDayOfQuarter(DateOrTime v) const
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{
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return toDate(toFirstDayOfQuarterIndex(v));
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}
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/// Round down to start of year.
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inline time_t toFirstDayOfYear(time_t t) const
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{
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return lut[years_lut[lut[findIndex(t)].year - DATE_LUT_MIN_YEAR]].date;
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}
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template <typename DateOrTime>
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inline LUTIndex toFirstDayNumOfYearIndex(DateOrTime v) const
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{
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return years_lut[lut[toLUTIndex(v)].year - DATE_LUT_MIN_YEAR];
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}
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template <typename DateOrTime>
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inline ExtendedDayNum toFirstDayNumOfYear(DateOrTime v) const
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{
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return toDayNum(toFirstDayNumOfYearIndex(v));
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}
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inline time_t toFirstDayOfNextMonth(time_t t) const
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{
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LUTIndex index = findIndex(t);
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index += 32 - lut[index].day_of_month;
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return lut[index - (lut[index].day_of_month - 1)].date;
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}
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inline time_t toFirstDayOfPrevMonth(time_t t) const
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{
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LUTIndex index = findIndex(t);
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index -= lut[index].day_of_month;
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return lut[index - (lut[index].day_of_month - 1)].date;
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}
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template <typename DateOrTime>
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inline UInt8 daysInMonth(DateOrTime value) const
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{
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const LUTIndex i = toLUTIndex(value);
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return lut[i].days_in_month;
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}
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inline UInt8 daysInMonth(Int16 year, UInt8 month) const
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{
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UInt16 idx = year - DATE_LUT_MIN_YEAR;
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if (unlikely(idx >= DATE_LUT_YEARS))
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return 31; /// Implementation specific behaviour on overflow.
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/// 32 makes arithmetic more simple.
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const auto any_day_of_month = years_lut[year - DATE_LUT_MIN_YEAR] + 32 * (month - 1);
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return lut[any_day_of_month].days_in_month;
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}
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/** Round to start of day, then shift for specified amount of days.
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*/
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inline time_t toDateAndShift(time_t t, Int32 days) const
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{
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return lut[findIndex(t) + days].date;
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}
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inline time_t toTime(time_t t) const
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{
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const LUTIndex index = findIndex(t);
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time_t res = t - lut[index].date;
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if (res >= lut[index].time_at_offset_change())
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res += lut[index].amount_of_offset_change();
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return res - offset_at_start_of_epoch; /// Starting at 1970-01-01 00:00:00 local time.
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}
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inline unsigned toHour(time_t t) const
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{
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const LUTIndex index = findIndex(t);
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time_t time = t - lut[index].date;
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if (time >= lut[index].time_at_offset_change())
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time += lut[index].amount_of_offset_change();
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unsigned res = time / 3600;
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/// In case time was changed backwards at the start of next day, we will repeat the hour 23.
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return res <= 23 ? res : 23;
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}
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/** Calculating offset from UTC in seconds.
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* which means Using the same literal time of "t" to get the corresponding timestamp in UTC,
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* then subtract the former from the latter to get the offset result.
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* The boundaries when meets DST(daylight saving time) change should be handled very carefully.
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*/
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inline time_t timezoneOffset(time_t t) const
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{
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const LUTIndex index = findIndex(t);
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/// Calculate daylight saving offset first.
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/// Because the "amount_of_offset_change" in LUT entry only exists in the change day, it's costly to scan it from the very begin.
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/// but we can figure out all the accumulated offsets from 1970-01-01 to that day just by get the whole difference between lut[].date,
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/// and then, we can directly subtract multiple 86400s to get the real DST offsets for the leap seconds is not considered now.
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time_t res = (lut[index].date - lut[daynum_offset_epoch].date) % 86400;
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/// As so far to know, the maximal DST offset couldn't be more than 2 hours, so after the modulo operation the remainder
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/// will sits between [-offset --> 0 --> offset] which respectively corresponds to moving clock forward or backward.
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res = res > 43200 ? (86400 - res) : (0 - res);
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/// Check if has a offset change during this day. Add the change when cross the line
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if (lut[index].amount_of_offset_change() != 0 && t >= lut[index].date + lut[index].time_at_offset_change())
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res += lut[index].amount_of_offset_change();
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return res + offset_at_start_of_epoch;
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}
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inline unsigned toSecond(time_t t) const
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{
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auto res = t % 60;
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if (likely(res >= 0))
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return res;
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return res + 60;
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}
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inline unsigned toMinute(time_t t) const
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{
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if (t >= 0 && offset_is_whole_number_of_hours_during_epoch)
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return (t / 60) % 60;
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/// To consider the DST changing situation within this day
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/// also make the special timezones with no whole hour offset such as 'Australia/Lord_Howe' been taken into account.
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LUTIndex index = findIndex(t);
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UInt32 time = t - lut[index].date;
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if (time >= lut[index].time_at_offset_change())
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time += lut[index].amount_of_offset_change();
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return time / 60 % 60;
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}
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/// NOTE: Assuming timezone offset is a multiple of 15 minutes.
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inline time_t toStartOfMinute(time_t t) const { return roundDown(t, 60); }
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inline time_t toStartOfFiveMinute(time_t t) const { return roundDown(t, 300); }
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inline time_t toStartOfFifteenMinutes(time_t t) const { return roundDown(t, 900); }
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inline time_t toStartOfTenMinutes(time_t t) const
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{
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if (t >= 0 && offset_is_whole_number_of_hours_during_epoch)
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return t / 600 * 600;
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/// More complex logic is for Nepal - it has offset 05:45. Australia/Eucla is also unfortunate.
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Int64 date = find(t).date;
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return date + (t - date) / 600 * 600;
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}
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|
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/// NOTE: Assuming timezone transitions are multiple of hours. Lord Howe Island in Australia is a notable exception.
|
|
inline time_t toStartOfHour(time_t t) const
|
|
{
|
|
if (t >= 0 && offset_is_whole_number_of_hours_during_epoch)
|
|
return t / 3600 * 3600;
|
|
|
|
Int64 date = find(t).date;
|
|
return date + (t - date) / 3600 * 3600;
|
|
}
|
|
|
|
/** Number of calendar day since the beginning of UNIX epoch (1970-01-01 is zero)
|
|
* We use just two bytes for it. It covers the range up to 2105 and slightly more.
|
|
*
|
|
* This is "calendar" day, it itself is independent of time zone
|
|
* (conversion from/to unix timestamp will depend on time zone,
|
|
* because the same calendar day starts/ends at different timestamps in different time zones)
|
|
*/
|
|
|
|
inline time_t fromDayNum(DayNum d) const { return lut[toLUTIndex(d)].date; }
|
|
inline time_t fromDayNum(ExtendedDayNum d) const { return lut[toLUTIndex(d)].date; }
|
|
|
|
template <typename DateOrTime>
|
|
inline time_t toDate(DateOrTime v) const { return lut[toLUTIndex(v)].date; }
|
|
|
|
template <typename DateOrTime>
|
|
inline unsigned toMonth(DateOrTime v) const { return lut[toLUTIndex(v)].month; }
|
|
|
|
template <typename DateOrTime>
|
|
inline unsigned toQuarter(DateOrTime v) const { return (lut[toLUTIndex(v)].month - 1) / 3 + 1; }
|
|
|
|
template <typename DateOrTime>
|
|
inline Int16 toYear(DateOrTime v) const { return lut[toLUTIndex(v)].year; }
|
|
|
|
template <typename DateOrTime>
|
|
inline unsigned toDayOfWeek(DateOrTime v) const { return lut[toLUTIndex(v)].day_of_week; }
|
|
|
|
template <typename DateOrTime>
|
|
inline unsigned toDayOfMonth(DateOrTime v) const { return lut[toLUTIndex(v)].day_of_month; }
|
|
|
|
template <typename DateOrTime>
|
|
inline unsigned toDayOfYear(DateOrTime v) const
|
|
{
|
|
// TODO: different overload for ExtendedDayNum
|
|
const LUTIndex i = toLUTIndex(v);
|
|
return i + 1 - toFirstDayNumOfYearIndex(i);
|
|
}
|
|
|
|
/// Number of week from some fixed moment in the past. Week begins at monday.
|
|
/// (round down to monday and divide DayNum by 7; we made an assumption,
|
|
/// that in domain of the function there was no weeks with any other number of days than 7)
|
|
template <typename DateOrTime>
|
|
inline unsigned toRelativeWeekNum(DateOrTime v) const
|
|
{
|
|
const LUTIndex i = toLUTIndex(v);
|
|
/// We add 8 to avoid underflow at beginning of unix epoch.
|
|
return toDayNum(i + 8 - toDayOfWeek(i)) / 7;
|
|
}
|
|
|
|
/// Get year that contains most of the current week. Week begins at monday.
|
|
template <typename DateOrTime>
|
|
inline unsigned toISOYear(DateOrTime v) const
|
|
{
|
|
const LUTIndex i = toLUTIndex(v);
|
|
/// That's effectively the year of thursday of current week.
|
|
return toYear(toLUTIndex(i + 4 - toDayOfWeek(i)));
|
|
}
|
|
|
|
/// ISO year begins with a monday of the week that is contained more than by half in the corresponding calendar year.
|
|
/// Example: ISO year 2019 begins at 2018-12-31. And ISO year 2017 begins at 2017-01-02.
|
|
/// https://en.wikipedia.org/wiki/ISO_week_date
|
|
template <typename DateOrTime>
|
|
inline LUTIndex toFirstDayNumOfISOYearIndex(DateOrTime v) const
|
|
{
|
|
const LUTIndex i = toLUTIndex(v);
|
|
auto iso_year = toISOYear(i);
|
|
|
|
const auto first_day_of_year = years_lut[iso_year - DATE_LUT_MIN_YEAR];
|
|
auto first_day_of_week_of_year = lut[first_day_of_year].day_of_week;
|
|
|
|
return LUTIndex{first_day_of_week_of_year <= 4
|
|
? first_day_of_year + 1 - first_day_of_week_of_year
|
|
: first_day_of_year + 8 - first_day_of_week_of_year};
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline ExtendedDayNum toFirstDayNumOfISOYear(DateOrTime v) const
|
|
{
|
|
return toDayNum(toFirstDayNumOfISOYearIndex(v));
|
|
}
|
|
|
|
inline time_t toFirstDayOfISOYear(time_t t) const
|
|
{
|
|
return lut[toFirstDayNumOfISOYearIndex(t)].date;
|
|
}
|
|
|
|
/// ISO 8601 week number. Week begins at monday.
|
|
/// The week number 1 is the first week in year that contains 4 or more days (that's more than half).
|
|
template <typename DateOrTime>
|
|
inline unsigned toISOWeek(DateOrTime v) const
|
|
{
|
|
return 1 + (toFirstDayNumOfWeek(v) - toFirstDayNumOfISOYear(v)) / 7;
|
|
}
|
|
|
|
/*
|
|
The bits in week_mode has the following meaning:
|
|
WeekModeFlag::MONDAY_FIRST (0) If not set Sunday is first day of week
|
|
If set Monday is first day of week
|
|
WeekModeFlag::YEAR (1) If not set Week is in range 0-53
|
|
|
|
Week 0 is returned for the the last week of the previous year (for
|
|
a date at start of january) In this case one can get 53 for the
|
|
first week of next year. This flag ensures that the week is
|
|
relevant for the given year. Note that this flag is only
|
|
relevant if WeekModeFlag::JANUARY is not set.
|
|
|
|
If set Week is in range 1-53.
|
|
|
|
In this case one may get week 53 for a date in January (when
|
|
the week is that last week of previous year) and week 1 for a
|
|
date in December.
|
|
|
|
WeekModeFlag::FIRST_WEEKDAY (2) If not set Weeks are numbered according
|
|
to ISO 8601:1988
|
|
If set The week that contains the first
|
|
'first-day-of-week' is week 1.
|
|
|
|
WeekModeFlag::NEWYEAR_DAY (3) If not set no meaning
|
|
If set The week that contains the January 1 is week 1.
|
|
Week is in range 1-53.
|
|
And ignore WeekModeFlag::YEAR, WeekModeFlag::FIRST_WEEKDAY
|
|
|
|
ISO 8601:1988 means that if the week containing January 1 has
|
|
four or more days in the new year, then it is week 1;
|
|
Otherwise it is the last week of the previous year, and the
|
|
next week is week 1.
|
|
*/
|
|
template <typename DateOrTime>
|
|
inline YearWeek toYearWeek(DateOrTime v, UInt8 week_mode) const
|
|
{
|
|
const bool newyear_day_mode = week_mode & static_cast<UInt8>(WeekModeFlag::NEWYEAR_DAY);
|
|
week_mode = check_week_mode(week_mode);
|
|
const bool monday_first_mode = week_mode & static_cast<UInt8>(WeekModeFlag::MONDAY_FIRST);
|
|
bool week_year_mode = week_mode & static_cast<UInt8>(WeekModeFlag::YEAR);
|
|
const bool first_weekday_mode = week_mode & static_cast<UInt8>(WeekModeFlag::FIRST_WEEKDAY);
|
|
|
|
const LUTIndex i = toLUTIndex(v);
|
|
|
|
// Calculate week number of WeekModeFlag::NEWYEAR_DAY mode
|
|
if (newyear_day_mode)
|
|
{
|
|
return toYearWeekOfNewyearMode(i, monday_first_mode);
|
|
}
|
|
|
|
YearWeek yw(toYear(i), 0);
|
|
UInt16 days = 0;
|
|
const auto daynr = makeDayNum(yw.first, toMonth(i), toDayOfMonth(i));
|
|
auto first_daynr = makeDayNum(yw.first, 1, 1);
|
|
|
|
// 0 for monday, 1 for tuesday ...
|
|
// get weekday from first day in year.
|
|
UInt16 weekday = calc_weekday(first_daynr, !monday_first_mode);
|
|
|
|
if (toMonth(i) == 1 && toDayOfMonth(i) <= static_cast<UInt32>(7 - weekday))
|
|
{
|
|
if (!week_year_mode && ((first_weekday_mode && weekday != 0) || (!first_weekday_mode && weekday >= 4)))
|
|
return yw;
|
|
week_year_mode = 1;
|
|
(yw.first)--;
|
|
first_daynr -= (days = calc_days_in_year(yw.first));
|
|
weekday = (weekday + 53 * 7 - days) % 7;
|
|
}
|
|
|
|
if ((first_weekday_mode && weekday != 0) || (!first_weekday_mode && weekday >= 4))
|
|
days = daynr - (first_daynr + (7 - weekday));
|
|
else
|
|
days = daynr - (first_daynr - weekday);
|
|
|
|
if (week_year_mode && days >= 52 * 7)
|
|
{
|
|
weekday = (weekday + calc_days_in_year(yw.first)) % 7;
|
|
if ((!first_weekday_mode && weekday < 4) || (first_weekday_mode && weekday == 0))
|
|
{
|
|
(yw.first)++;
|
|
yw.second = 1;
|
|
return yw;
|
|
}
|
|
}
|
|
yw.second = days / 7 + 1;
|
|
return yw;
|
|
}
|
|
|
|
/// Calculate week number of WeekModeFlag::NEWYEAR_DAY mode
|
|
/// The week number 1 is the first week in year that contains January 1,
|
|
template <typename DateOrTime>
|
|
inline YearWeek toYearWeekOfNewyearMode(DateOrTime v, bool monday_first_mode) const
|
|
{
|
|
YearWeek yw(0, 0);
|
|
UInt16 offset_day = monday_first_mode ? 0U : 1U;
|
|
|
|
const LUTIndex i = LUTIndex(v);
|
|
|
|
// Checking the week across the year
|
|
yw.first = toYear(i + 7 - toDayOfWeek(i + offset_day));
|
|
|
|
auto first_day = makeLUTIndex(yw.first, 1, 1);
|
|
auto this_day = i;
|
|
|
|
// TODO: do not perform calculations in terms of DayNum, since that would under/overflow for extended range.
|
|
if (monday_first_mode)
|
|
{
|
|
// Rounds down a date to the nearest Monday.
|
|
first_day = toFirstDayNumOfWeek(first_day);
|
|
this_day = toFirstDayNumOfWeek(i);
|
|
}
|
|
else
|
|
{
|
|
// Rounds down a date to the nearest Sunday.
|
|
if (toDayOfWeek(first_day) != 7)
|
|
first_day = ExtendedDayNum(first_day - toDayOfWeek(first_day));
|
|
if (toDayOfWeek(i) != 7)
|
|
this_day = ExtendedDayNum(i - toDayOfWeek(i));
|
|
}
|
|
yw.second = (this_day - first_day) / 7 + 1;
|
|
return yw;
|
|
}
|
|
|
|
/// Get first day of week with week_mode, return Sunday or Monday
|
|
template <typename DateOrTime>
|
|
inline ExtendedDayNum toFirstDayNumOfWeek(DateOrTime v, UInt8 week_mode) const
|
|
{
|
|
bool monday_first_mode = week_mode & static_cast<UInt8>(WeekModeFlag::MONDAY_FIRST);
|
|
if (monday_first_mode)
|
|
{
|
|
return toFirstDayNumOfWeek(v);
|
|
}
|
|
else
|
|
{
|
|
return (toDayOfWeek(v) != 7) ? ExtendedDayNum(v - toDayOfWeek(v)) : toDayNum(v);
|
|
}
|
|
}
|
|
|
|
/// Check and change mode to effective.
|
|
inline UInt8 check_week_mode(UInt8 mode) const
|
|
{
|
|
UInt8 week_format = (mode & 7);
|
|
if (!(week_format & static_cast<UInt8>(WeekModeFlag::MONDAY_FIRST)))
|
|
week_format ^= static_cast<UInt8>(WeekModeFlag::FIRST_WEEKDAY);
|
|
return week_format;
|
|
}
|
|
|
|
/** Calculate weekday from d.
|
|
* Returns 0 for monday, 1 for tuesday...
|
|
*/
|
|
template <typename DateOrTime>
|
|
inline unsigned calc_weekday(DateOrTime v, bool sunday_first_day_of_week) const
|
|
{
|
|
const LUTIndex i = toLUTIndex(v);
|
|
if (!sunday_first_day_of_week)
|
|
return toDayOfWeek(i) - 1;
|
|
else
|
|
return toDayOfWeek(i + 1) - 1;
|
|
}
|
|
|
|
/// Calculate days in one year.
|
|
inline unsigned calc_days_in_year(Int32 year) const
|
|
{
|
|
return ((year & 3) == 0 && (year % 100 || (year % 400 == 0 && year)) ? 366 : 365);
|
|
}
|
|
|
|
/// Number of month from some fixed moment in the past (year * 12 + month)
|
|
template <typename DateOrTime>
|
|
inline unsigned toRelativeMonthNum(DateOrTime v) const
|
|
{
|
|
const LUTIndex i = toLUTIndex(v);
|
|
return lut[i].year * 12 + lut[i].month;
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline unsigned toRelativeQuarterNum(DateOrTime v) const
|
|
{
|
|
const LUTIndex i = toLUTIndex(v);
|
|
return lut[i].year * 4 + (lut[i].month - 1) / 3;
|
|
}
|
|
|
|
/// We count all hour-length intervals, unrelated to offset changes.
|
|
inline time_t toRelativeHourNum(time_t t) const
|
|
{
|
|
if (t >= 0 && offset_is_whole_number_of_hours_during_epoch)
|
|
return t / 3600;
|
|
|
|
/// Assume that if offset was fractional, then the fraction is the same as at the beginning of epoch.
|
|
/// NOTE This assumption is false for "Pacific/Pitcairn" and "Pacific/Kiritimati" time zones.
|
|
return (t + DATE_LUT_ADD + 86400 - offset_at_start_of_epoch) / 3600 - (DATE_LUT_ADD / 3600);
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline time_t toRelativeHourNum(DateOrTime v) const
|
|
{
|
|
return toRelativeHourNum(lut[toLUTIndex(v)].date);
|
|
}
|
|
|
|
inline time_t toRelativeMinuteNum(time_t t) const
|
|
{
|
|
return (t + DATE_LUT_ADD) / 60 - (DATE_LUT_ADD / 60);
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline time_t toRelativeMinuteNum(DateOrTime v) const
|
|
{
|
|
return toRelativeMinuteNum(lut[toLUTIndex(v)].date);
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline ExtendedDayNum toStartOfYearInterval(DateOrTime v, UInt64 years) const
|
|
{
|
|
if (years == 1)
|
|
return toFirstDayNumOfYear(v);
|
|
|
|
const LUTIndex i = toLUTIndex(v);
|
|
|
|
UInt16 year = lut[i].year / years * years;
|
|
|
|
/// For example, rounding down 1925 to 100 years will be 1900, but it's less than min supported year.
|
|
if (unlikely(year < DATE_LUT_MIN_YEAR))
|
|
year = DATE_LUT_MIN_YEAR;
|
|
|
|
return toDayNum(years_lut[year - DATE_LUT_MIN_YEAR]);
|
|
}
|
|
|
|
inline ExtendedDayNum toStartOfQuarterInterval(ExtendedDayNum d, UInt64 quarters) const
|
|
{
|
|
if (quarters == 1)
|
|
return toFirstDayNumOfQuarter(d);
|
|
return toStartOfMonthInterval(d, quarters * 3);
|
|
}
|
|
|
|
inline ExtendedDayNum toStartOfMonthInterval(ExtendedDayNum d, UInt64 months) const
|
|
{
|
|
if (months == 1)
|
|
return toFirstDayNumOfMonth(d);
|
|
const Values & values = lut[toLUTIndex(d)];
|
|
UInt32 month_total_index = (values.year - DATE_LUT_MIN_YEAR) * 12 + values.month - 1;
|
|
return toDayNum(years_months_lut[month_total_index / months * months]);
|
|
}
|
|
|
|
inline ExtendedDayNum toStartOfWeekInterval(ExtendedDayNum d, UInt64 weeks) const
|
|
{
|
|
if (weeks == 1)
|
|
return toFirstDayNumOfWeek(d);
|
|
UInt64 days = weeks * 7;
|
|
// January 1st 1970 was Thursday so we need this 4-days offset to make weeks start on Monday.
|
|
return ExtendedDayNum(4 + (d - 4) / days * days);
|
|
}
|
|
|
|
inline time_t toStartOfDayInterval(ExtendedDayNum d, UInt64 days) const
|
|
{
|
|
if (days == 1)
|
|
return toDate(d);
|
|
return lut[toLUTIndex(ExtendedDayNum(d / days * days))].date;
|
|
}
|
|
|
|
inline time_t toStartOfHourInterval(time_t t, UInt64 hours) const
|
|
{
|
|
if (hours == 1)
|
|
return toStartOfHour(t);
|
|
UInt64 seconds = hours * 3600;
|
|
|
|
t = roundDown(t, seconds);
|
|
|
|
if (t >= 0 && offset_is_whole_number_of_hours_during_epoch)
|
|
return t;
|
|
|
|
/// TODO check if it's correct.
|
|
return toStartOfHour(t);
|
|
}
|
|
|
|
inline time_t toStartOfMinuteInterval(time_t t, UInt64 minutes) const
|
|
{
|
|
if (minutes == 1)
|
|
return toStartOfMinute(t);
|
|
|
|
UInt64 seconds = 60 * minutes;
|
|
return roundDown(t, seconds);
|
|
}
|
|
|
|
inline time_t toStartOfSecondInterval(time_t t, UInt64 seconds) const
|
|
{
|
|
if (seconds == 1)
|
|
return t;
|
|
|
|
return roundDown(t, seconds);
|
|
}
|
|
|
|
inline LUTIndex makeLUTIndex(Int16 year, UInt8 month, UInt8 day_of_month) const
|
|
{
|
|
if (unlikely(year < DATE_LUT_MIN_YEAR || year > DATE_LUT_MAX_YEAR || month < 1 || month > 12 || day_of_month < 1 || day_of_month > 31))
|
|
return LUTIndex(0);
|
|
|
|
return LUTIndex{years_months_lut[(year - DATE_LUT_MIN_YEAR) * 12 + month - 1] + day_of_month - 1};
|
|
}
|
|
|
|
/// Create DayNum from year, month, day of month.
|
|
inline ExtendedDayNum makeDayNum(Int16 year, UInt8 month, UInt8 day_of_month) const
|
|
{
|
|
if (unlikely(year < DATE_LUT_MIN_YEAR || year > DATE_LUT_MAX_YEAR || month < 1 || month > 12 || day_of_month < 1 || day_of_month > 31))
|
|
return ExtendedDayNum(0);
|
|
|
|
return toDayNum(makeLUTIndex(year, month, day_of_month));
|
|
}
|
|
|
|
inline time_t makeDate(Int16 year, UInt8 month, UInt8 day_of_month) const
|
|
{
|
|
return lut[makeLUTIndex(year, month, day_of_month)].date;
|
|
}
|
|
|
|
/** Does not accept daylight saving time as argument: in case of ambiguity, it choose greater timestamp.
|
|
*/
|
|
inline time_t makeDateTime(Int16 year, UInt8 month, UInt8 day_of_month, UInt8 hour, UInt8 minute, UInt8 second) const
|
|
{
|
|
size_t index = makeLUTIndex(year, month, day_of_month);
|
|
UInt32 time_offset = hour * 3600 + minute * 60 + second;
|
|
|
|
if (time_offset >= lut[index].time_at_offset_change())
|
|
time_offset -= lut[index].amount_of_offset_change();
|
|
|
|
return lut[index].date + time_offset;
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline const Values & getValues(DateOrTime v) const { return lut[toLUTIndex(v)]; }
|
|
|
|
template <typename DateOrTime>
|
|
inline UInt32 toNumYYYYMM(DateOrTime v) const
|
|
{
|
|
const Values & values = getValues(v);
|
|
return values.year * 100 + values.month;
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline UInt32 toNumYYYYMMDD(DateOrTime v) const
|
|
{
|
|
const Values & values = getValues(v);
|
|
return values.year * 10000 + values.month * 100 + values.day_of_month;
|
|
}
|
|
|
|
inline time_t YYYYMMDDToDate(UInt32 num) const
|
|
{
|
|
return makeDate(num / 10000, num / 100 % 100, num % 100);
|
|
}
|
|
|
|
inline ExtendedDayNum YYYYMMDDToDayNum(UInt32 num) const
|
|
{
|
|
return makeDayNum(num / 10000, num / 100 % 100, num % 100);
|
|
}
|
|
|
|
|
|
struct DateComponents
|
|
{
|
|
uint16_t year;
|
|
uint8_t month;
|
|
uint8_t day;
|
|
};
|
|
|
|
struct TimeComponents
|
|
{
|
|
uint8_t hour;
|
|
uint8_t minute;
|
|
uint8_t second;
|
|
};
|
|
|
|
struct DateTimeComponents
|
|
{
|
|
DateComponents date;
|
|
TimeComponents time;
|
|
};
|
|
|
|
inline DateComponents toDateComponents(time_t t) const
|
|
{
|
|
const Values & values = getValues(t);
|
|
return { values.year, values.month, values.day_of_month };
|
|
}
|
|
|
|
inline DateTimeComponents toDateTimeComponents(time_t t) const
|
|
{
|
|
const LUTIndex index = findIndex(t);
|
|
const Values & values = lut[index];
|
|
|
|
DateTimeComponents res;
|
|
|
|
res.date.year = values.year;
|
|
res.date.month = values.month;
|
|
res.date.day = values.day_of_month;
|
|
|
|
time_t time = t - values.date;
|
|
if (time >= values.time_at_offset_change())
|
|
time += values.amount_of_offset_change();
|
|
|
|
if (unlikely(time < 0))
|
|
{
|
|
res.time.second = 0;
|
|
res.time.minute = 0;
|
|
res.time.hour = 0;
|
|
}
|
|
else
|
|
{
|
|
res.time.second = time % 60;
|
|
res.time.minute = time / 60 % 60;
|
|
res.time.hour = time / 3600;
|
|
}
|
|
|
|
/// In case time was changed backwards at the start of next day, we will repeat the hour 23.
|
|
if (unlikely(res.time.hour > 23))
|
|
res.time.hour = 23;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
inline UInt64 toNumYYYYMMDDhhmmss(time_t t) const
|
|
{
|
|
DateTimeComponents components = toDateTimeComponents(t);
|
|
|
|
return
|
|
components.time.second
|
|
+ components.time.minute * 100
|
|
+ components.time.hour * 10000
|
|
+ UInt64(components.date.day) * 1000000
|
|
+ UInt64(components.date.month) * 100000000
|
|
+ UInt64(components.date.year) * 10000000000;
|
|
}
|
|
|
|
inline time_t YYYYMMDDhhmmssToTime(UInt64 num) const
|
|
{
|
|
return makeDateTime(
|
|
num / 10000000000,
|
|
num / 100000000 % 100,
|
|
num / 1000000 % 100,
|
|
num / 10000 % 100,
|
|
num / 100 % 100,
|
|
num % 100);
|
|
}
|
|
|
|
/// Adding calendar intervals.
|
|
/// Implementation specific behaviour when delta is too big.
|
|
|
|
inline NO_SANITIZE_UNDEFINED time_t addDays(time_t t, Int64 delta) const
|
|
{
|
|
const LUTIndex index = findIndex(t);
|
|
const Values & values = lut[index];
|
|
|
|
time_t time = t - values.date;
|
|
if (time >= values.time_at_offset_change())
|
|
time += values.amount_of_offset_change();
|
|
|
|
const LUTIndex new_index = index + delta;
|
|
|
|
if (time >= lut[new_index].time_at_offset_change())
|
|
time -= lut[new_index].amount_of_offset_change();
|
|
|
|
return lut[new_index].date + time;
|
|
}
|
|
|
|
inline NO_SANITIZE_UNDEFINED time_t addWeeks(time_t t, Int64 delta) const
|
|
{
|
|
return addDays(t, delta * 7);
|
|
}
|
|
|
|
inline UInt8 saturateDayOfMonth(Int16 year, UInt8 month, UInt8 day_of_month) const
|
|
{
|
|
if (likely(day_of_month <= 28))
|
|
return day_of_month;
|
|
|
|
UInt8 days_in_month = daysInMonth(year, month);
|
|
|
|
if (day_of_month > days_in_month)
|
|
day_of_month = days_in_month;
|
|
|
|
return day_of_month;
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline LUTIndex NO_SANITIZE_UNDEFINED addMonthsIndex(DateOrTime v, Int64 delta) const
|
|
{
|
|
const Values & values = lut[toLUTIndex(v)];
|
|
|
|
Int64 month = values.month + delta;
|
|
|
|
if (month > 0)
|
|
{
|
|
auto year = values.year + (month - 1) / 12;
|
|
month = ((month - 1) % 12) + 1;
|
|
auto day_of_month = saturateDayOfMonth(year, month, values.day_of_month);
|
|
|
|
return makeLUTIndex(year, month, day_of_month);
|
|
}
|
|
else
|
|
{
|
|
auto year = values.year - (12 - month) / 12;
|
|
month = 12 - (-month % 12);
|
|
auto day_of_month = saturateDayOfMonth(year, month, values.day_of_month);
|
|
|
|
return makeLUTIndex(year, month, day_of_month);
|
|
}
|
|
}
|
|
|
|
/// If resulting month has less deys than source month, then saturation can happen.
|
|
/// Example: 31 Aug + 1 month = 30 Sep.
|
|
inline time_t NO_SANITIZE_UNDEFINED addMonths(time_t t, Int64 delta) const
|
|
{
|
|
const auto result_day = addMonthsIndex(t, delta);
|
|
|
|
const LUTIndex index = findIndex(t);
|
|
const Values & values = lut[index];
|
|
|
|
time_t time = t - values.date;
|
|
if (time >= values.time_at_offset_change())
|
|
time += values.amount_of_offset_change();
|
|
|
|
if (time >= lut[result_day].time_at_offset_change())
|
|
time -= lut[result_day].amount_of_offset_change();
|
|
|
|
return lut[result_day].date + time;
|
|
}
|
|
|
|
inline ExtendedDayNum NO_SANITIZE_UNDEFINED addMonths(ExtendedDayNum d, Int64 delta) const
|
|
{
|
|
return toDayNum(addMonthsIndex(d, delta));
|
|
}
|
|
|
|
inline time_t NO_SANITIZE_UNDEFINED addQuarters(time_t t, Int64 delta) const
|
|
{
|
|
return addMonths(t, delta * 3);
|
|
}
|
|
|
|
inline ExtendedDayNum addQuarters(ExtendedDayNum d, Int64 delta) const
|
|
{
|
|
return addMonths(d, delta * 3);
|
|
}
|
|
|
|
template <typename DateOrTime>
|
|
inline LUTIndex NO_SANITIZE_UNDEFINED addYearsIndex(DateOrTime v, Int64 delta) const
|
|
{
|
|
const Values & values = lut[toLUTIndex(v)];
|
|
|
|
auto year = values.year + delta;
|
|
auto month = values.month;
|
|
auto day_of_month = values.day_of_month;
|
|
|
|
/// Saturation to 28 Feb can happen.
|
|
if (unlikely(day_of_month == 29 && month == 2))
|
|
day_of_month = saturateDayOfMonth(year, month, day_of_month);
|
|
|
|
return makeLUTIndex(year, month, day_of_month);
|
|
}
|
|
|
|
/// Saturation can occur if 29 Feb is mapped to non-leap year.
|
|
inline time_t addYears(time_t t, Int64 delta) const
|
|
{
|
|
auto result_day = addYearsIndex(t, delta);
|
|
|
|
const LUTIndex index = findIndex(t);
|
|
const Values & values = lut[index];
|
|
|
|
time_t time = t - values.date;
|
|
if (time >= values.time_at_offset_change())
|
|
time += values.amount_of_offset_change();
|
|
|
|
if (time >= lut[result_day].time_at_offset_change())
|
|
time -= lut[result_day].amount_of_offset_change();
|
|
|
|
return lut[result_day].date + time;
|
|
}
|
|
|
|
inline ExtendedDayNum addYears(ExtendedDayNum d, Int64 delta) const
|
|
{
|
|
return toDayNum(addYearsIndex(d, delta));
|
|
}
|
|
|
|
|
|
inline std::string timeToString(time_t t) const
|
|
{
|
|
DateTimeComponents components = toDateTimeComponents(t);
|
|
|
|
std::string s {"0000-00-00 00:00:00"};
|
|
|
|
s[0] += components.date.year / 1000;
|
|
s[1] += (components.date.year / 100) % 10;
|
|
s[2] += (components.date.year / 10) % 10;
|
|
s[3] += components.date.year % 10;
|
|
s[5] += components.date.month / 10;
|
|
s[6] += components.date.month % 10;
|
|
s[8] += components.date.day / 10;
|
|
s[9] += components.date.day % 10;
|
|
|
|
s[11] += components.time.hour / 10;
|
|
s[12] += components.time.hour % 10;
|
|
s[14] += components.time.minute / 10;
|
|
s[15] += components.time.minute % 10;
|
|
s[17] += components.time.second / 10;
|
|
s[18] += components.time.second % 10;
|
|
|
|
return s;
|
|
}
|
|
|
|
inline std::string dateToString(time_t t) const
|
|
{
|
|
const Values & values = getValues(t);
|
|
|
|
std::string s {"0000-00-00"};
|
|
|
|
s[0] += values.year / 1000;
|
|
s[1] += (values.year / 100) % 10;
|
|
s[2] += (values.year / 10) % 10;
|
|
s[3] += values.year % 10;
|
|
s[5] += values.month / 10;
|
|
s[6] += values.month % 10;
|
|
s[8] += values.day_of_month / 10;
|
|
s[9] += values.day_of_month % 10;
|
|
|
|
return s;
|
|
}
|
|
|
|
inline std::string dateToString(ExtendedDayNum d) const
|
|
{
|
|
const Values & values = getValues(d);
|
|
|
|
std::string s {"0000-00-00"};
|
|
|
|
s[0] += values.year / 1000;
|
|
s[1] += (values.year / 100) % 10;
|
|
s[2] += (values.year / 10) % 10;
|
|
s[3] += values.year % 10;
|
|
s[5] += values.month / 10;
|
|
s[6] += values.month % 10;
|
|
s[8] += values.day_of_month / 10;
|
|
s[9] += values.day_of_month % 10;
|
|
|
|
return s;
|
|
}
|
|
};
|
|
|
|
#if defined(__PPC__)
|
|
#if !__clang__
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
#endif
|