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611 lines
20 KiB
C++
611 lines
20 KiB
C++
#pragma once
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#include <common/Types.h>
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#include <common/likely.h>
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#include <common/strong_typedef.h>
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#include <ctime>
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#define DATE_LUT_MAX (0xFFFFFFFFU - 86400)
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#define DATE_LUT_MAX_DAY_NUM (0xFFFFFFFFU / 86400)
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/// Table size is bigger than DATE_LUT_MAX_DAY_NUM to fill all indices within UInt16 range: this allows to remove extra check.
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#define DATE_LUT_SIZE 0x10000
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#define DATE_LUT_MIN_YEAR 1970
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#define DATE_LUT_MAX_YEAR 2105 /// Last supported year
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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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STRONG_TYPEDEF(UInt16, DayNum_t);
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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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public:
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DateLUTImpl(const std::string & time_zone);
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public:
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struct Values
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{
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/// Least significat 32 bits from time_t at beginning of the day.
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/// If the unix timestamp of beginning of the day is negative (example: 1970-01-01 MSK, where time_t == -10800), then value is zero.
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/// Change to time_t; change constants above; and recompile the sources if you need to support time after 2105 year.
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UInt32 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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UInt16 time_at_offset_change; /// In seconds from beginning of the day. Assuming offset never changed close to the end of day (so, value < 65536).
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Int16 amount_of_offset_change; /// Usually -3600 or 3600, but look at Lord Howe Island.
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};
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private:
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/// Lookup table is indexed by DayNum.
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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];
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/// Year number after DATE_LUT_MIN_YEAR -> day num for start of year.
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DayNum_t years_lut[DATE_LUT_YEARS];
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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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bool offset_is_whole_number_of_hours_everytime;
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/// Time zone name.
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std::string time_zone;
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inline size_t findIndex(time_t t) const
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{
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/// First guess.
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size_t guess = t / 86400;
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if (guess >= DATE_LUT_MAX_DAY_NUM)
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return 0;
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if (t >= lut[guess].date && t < lut[guess + 1].date)
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return guess;
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for (size_t i = 1;; ++i)
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{
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if (guess + i >= DATE_LUT_MAX_DAY_NUM)
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return 0;
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if (t >= lut[guess + i].date && t < lut[guess + i + 1].date)
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return guess + i;
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if (guess < i)
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return 0;
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if (t >= lut[guess - i].date && t < lut[guess - i + 1].date)
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return guess - i;
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}
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}
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inline const Values & find(time_t t) const
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{
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return lut[findIndex(t)];
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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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/// All functions below are thread-safe; arguments are not checked.
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inline time_t toDate(time_t t) const { return find(t).date; }
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inline unsigned toMonth(time_t t) const { return find(t).month; }
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inline unsigned toYear(time_t t) const { return find(t).year; }
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inline unsigned toDayOfWeek(time_t t) const { return find(t).day_of_week; }
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inline unsigned toDayOfMonth(time_t t) const { return find(t).day_of_month; }
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/// Round down to start of monday.
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inline time_t toFirstDayOfWeek(time_t t) const
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{
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size_t index = findIndex(t);
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return lut[index - (lut[index].day_of_week - 1)].date;
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}
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inline DayNum_t toFirstDayNumOfWeek(DayNum_t d) const
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{
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return DayNum_t(d - (lut[d].day_of_week - 1));
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}
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inline DayNum_t toFirstDayNumOfWeek(time_t t) const
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{
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size_t index = findIndex(t);
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return DayNum_t(index - (lut[index].day_of_week - 1));
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}
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/// Round down to start of month.
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inline time_t toFirstDayOfMonth(time_t t) const
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{
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size_t index = findIndex(t);
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return lut[index - (lut[index].day_of_month - 1)].date;
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}
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inline DayNum_t toFirstDayNumOfMonth(DayNum_t d) const
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{
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return DayNum_t(d - (lut[d].day_of_month - 1));
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}
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inline DayNum_t toFirstDayNumOfMonth(time_t t) const
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{
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size_t index = findIndex(t);
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return DayNum_t(index - (lut[index].day_of_month - 1));
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}
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/// Round down to start of quarter.
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inline DayNum_t toFirstDayNumOfQuarter(DayNum_t d) const
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{
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size_t index = d;
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size_t month_inside_quarter = (lut[index].month - 1) % 3;
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index = index - lut[index].day_of_month;
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while (month_inside_quarter)
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{
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index = index - lut[index].day_of_month;
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--month_inside_quarter;
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}
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return DayNum_t(index + 1);
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}
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inline DayNum_t toFirstDayNumOfQuarter(time_t t) const
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{
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return toFirstDayNumOfQuarter(toDayNum(t));
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}
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inline time_t toFirstDayOfQuarter(time_t t) const
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{
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return fromDayNum(toFirstDayNumOfQuarter(t));
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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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inline DayNum_t toFirstDayNumOfYear(DayNum_t d) const
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{
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return years_lut[lut[d].year - DATE_LUT_MIN_YEAR];
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}
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inline time_t toFirstDayNumOfYear(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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inline time_t toFirstDayOfNextMonth(time_t t) const
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{
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size_t 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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size_t 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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inline UInt8 daysInMonth(DayNum_t d) const
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{
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return lut[d].days_in_month;
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}
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inline UInt8 daysInMonth(time_t t) const
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{
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return find(t).days_in_month;
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}
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inline UInt8 daysInMonth(UInt16 year, UInt8 month) const
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{
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auto any_day_of_month = years_lut[year - DATE_LUT_MIN_YEAR] + 31 * (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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size_t index = findIndex(t);
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if (unlikely(index == 0))
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return t + offset_at_start_of_epoch;
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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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size_t index = findIndex(t);
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if (unlikely(index == 0))
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return (t + offset_at_start_of_epoch) / 3600;
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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 / 3600;
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}
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/** Only for time zones with/when offset from UTC is multiple of five minutes.
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* This is true for all time zones: right now, all time zones have an offset that is multiple of 15 minutes.
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*
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* "By 1929, most major countries had adopted hourly time zones. Nepal was the last
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* country to adopt a standard offset, shifting slightly to UTC+5:45 in 1986."
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* - https://en.wikipedia.org/wiki/Time_zone#Offsets_from_UTC
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*
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* Also please note, that unix timestamp doesn't count "leap seconds":
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* each minute, with added or subtracted leap second, spans exactly 60 unix timestamps.
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*/
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inline unsigned toSecond(time_t t) const { return t % 60; }
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inline unsigned toMinute(time_t t) const
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{
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if (offset_is_whole_number_of_hours_everytime)
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return (t / 60) % 60;
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time_t date = find(t).date;
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return (t - date) / 60 % 60;
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}
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inline time_t toStartOfMinute(time_t t) const { return t / 60 * 60; }
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inline time_t toStartOfFiveMinute(time_t t) const { return t / 300 * 300; }
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inline time_t toStartOfHour(time_t t) const
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{
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if (offset_is_whole_number_of_hours_everytime)
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return t / 3600 * 3600;
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time_t date = find(t).date;
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/// Still can return wrong values for time at 1970-01-01 if the UTC offset was non-whole number of hours.
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return date + (t - date) / 3600 * 3600;
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}
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/** Number of calendar day since the beginning of UNIX epoch (1970-01-01 is zero)
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* We use just two bytes for it. It covers the range up to 2105 and slightly more.
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*
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* This is "calendar" day, it itself is independent of time zone
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* (conversion from/to unix timestamp will depend on time zone,
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* because the same calendar day starts/ends at different timestamps in different time zones)
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*/
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inline DayNum_t toDayNum(time_t t) const { return static_cast<DayNum_t>(findIndex(t)); }
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inline time_t fromDayNum(DayNum_t d) const { return lut[d].date; }
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inline time_t toDate(DayNum_t d) const { return lut[d].date; }
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inline unsigned toMonth(DayNum_t d) const { return lut[d].month; }
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inline unsigned toYear(DayNum_t d) const { return lut[d].year; }
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inline unsigned toDayOfWeek(DayNum_t d) const { return lut[d].day_of_week; }
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inline unsigned toDayOfMonth(DayNum_t d) const { return lut[d].day_of_month; }
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/// Number of week from some fixed moment in the past. Week begins at monday.
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/// (round down to monday and divide DayNum by 7; we made an assumption,
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/// that in domain of the function there was no weeks with any other number of days than 7)
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inline unsigned toRelativeWeekNum(DayNum_t d) const
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{
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/// We add 8 to avoid underflow at beginning of unix epoch.
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return (d + 8 - lut[d].day_of_week) / 7;
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}
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inline unsigned toRelativeWeekNum(time_t t) const
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{
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size_t index = findIndex(t);
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return (index + 8 - lut[index].day_of_week) / 7;
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}
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/// Number of month from some fixed moment in the past (year * 12 + month)
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inline unsigned toRelativeMonthNum(DayNum_t d) const
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{
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return lut[d].year * 12 + lut[d].month;
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}
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inline unsigned toRelativeMonthNum(time_t t) const
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{
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size_t index = findIndex(t);
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return lut[index].year * 12 + lut[index].month;
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}
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/// We calculate all hour-length intervals, unrelated to offset changes.
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inline time_t toRelativeHourNum(time_t t) const
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{
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if (offset_is_whole_number_of_hours_everytime)
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return t / 3600;
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/// Assume that if offset was fractional, then the fraction is the same as at the beginning of epoch.
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/// NOTE This assumption is false for "Pacific/Pitcairn" time zone.
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return (t + 86400 - offset_at_start_of_epoch) / 3600;
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}
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inline time_t toRelativeMinuteNum(time_t t) const
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{
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return t / 60;
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}
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/// Create DayNum_t from year, month, day of month.
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inline DayNum_t makeDayNum(UInt16 year, UInt8 month, UInt8 day_of_month) const
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{
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if (unlikely(year < DATE_LUT_MIN_YEAR || year > DATE_LUT_MAX_YEAR || month < 1 || month > 12 || day_of_month < 1 || day_of_month > 31))
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return DayNum_t(0);
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DayNum_t any_day_of_month(years_lut[year - DATE_LUT_MIN_YEAR] + 31 * (month - 1));
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return DayNum_t(any_day_of_month - toDayOfMonth(any_day_of_month) + day_of_month);
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}
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inline time_t makeDate(UInt16 year, UInt8 month, UInt8 day_of_month) const
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{
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return lut[makeDayNum(year, month, day_of_month)].date;
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}
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/** Does not accept daylight saving time as argument: in case of ambiguity, it choose greater timestamp.
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*/
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inline time_t makeDateTime(UInt16 year, UInt8 month, UInt8 day_of_month, UInt8 hour, UInt8 minute, UInt8 second) const
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{
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size_t index = makeDayNum(year, month, day_of_month);
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time_t time_offset = hour * 3600 + minute * 60 + second;
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if (time_offset >= lut[index].time_at_offset_change)
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time_offset -= lut[index].amount_of_offset_change;
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return lut[index].date + time_offset;
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}
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inline const Values & getValues(DayNum_t d) const { return lut[d]; }
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inline const Values & getValues(time_t t) const { return lut[findIndex(t)]; }
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inline UInt32 toNumYYYYMM(time_t t) const
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{
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const Values & values = find(t);
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return values.year * 100 + values.month;
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}
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inline UInt32 toNumYYYYMM(DayNum_t d) const
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{
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const Values & values = lut[d];
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return values.year * 100 + values.month;
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}
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inline UInt32 toNumYYYYMMDD(time_t t) const
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{
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const Values & values = find(t);
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return values.year * 10000 + values.month * 100 + values.day_of_month;
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}
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inline UInt32 toNumYYYYMMDD(DayNum_t d) const
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{
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const Values & values = lut[d];
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return values.year * 10000 + values.month * 100 + values.day_of_month;
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}
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inline time_t YYYYMMDDToDate(UInt32 num) const
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{
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return makeDate(num / 10000, num / 100 % 100, num % 100);
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}
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inline DayNum_t YYYYMMDDToDayNum(UInt32 num) const
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{
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return makeDayNum(num / 10000, num / 100 % 100, num % 100);
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}
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inline UInt64 toNumYYYYMMDDhhmmss(time_t t) const
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{
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const Values & values = find(t);
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return
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toSecond(t)
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+ toMinute(t) * 100
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+ toHour(t) * 10000
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+ UInt64(values.day_of_month) * 1000000
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+ UInt64(values.month) * 100000000
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+ UInt64(values.year) * 10000000000;
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}
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inline time_t YYYYMMDDhhmmssToTime(UInt64 num) const
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{
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return makeDateTime(
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num / 10000000000,
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num / 100000000 % 100,
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num / 1000000 % 100,
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num / 10000 % 100,
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num / 100 % 100,
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num % 100);
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}
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/// Adding calendar intervals.
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/// Implementation specific behaviour when delta is too big.
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inline time_t addDays(time_t t, Int64 delta) const
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{
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size_t index = findIndex(t);
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time_t time_offset = toHour(t) * 3600 + toMinute(t) * 60 + toSecond(t);
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index += delta;
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if (time_offset >= lut[index].time_at_offset_change)
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time_offset -= lut[index].amount_of_offset_change;
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return lut[index].date + time_offset;
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}
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inline time_t addWeeks(time_t t, Int64 delta) const
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{
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return addDays(t, delta * 7);
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}
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inline UInt8 saturateDayOfMonth(UInt16 year, UInt8 month, UInt8 day_of_month) const
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{
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if (likely(day_of_month <= 28))
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return day_of_month;
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UInt8 days_in_month = daysInMonth(year, month);
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if (day_of_month > days_in_month)
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day_of_month = days_in_month;
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return day_of_month;
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}
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/// If resulting month has less deys than source month, then saturation can happen.
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/// Example: 31 Aug + 1 month = 30 Sep.
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inline time_t addMonths(time_t t, Int64 delta) const
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{
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size_t index = findIndex(t);
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const Values & values = lut[index];
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time_t time_offset = toHour(t) * 3600 + toMinute(t) * 60 + toSecond(t);
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auto month = values.month + delta;
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auto year = values.year + (month - 1) / 12;
|
|
month = ((month - 1) % 12) + 1;
|
|
auto day_of_month = saturateDayOfMonth(year, month, values.day_of_month);
|
|
|
|
DayNum_t result_day = makeDayNum(year, month, day_of_month);
|
|
|
|
if (time_offset >= lut[result_day].time_at_offset_change)
|
|
time_offset -= lut[result_day].amount_of_offset_change;
|
|
|
|
return lut[result_day].date + time_offset;
|
|
}
|
|
|
|
inline DayNum_t addMonths(DayNum_t d, Int64 delta) const
|
|
{
|
|
const Values & values = lut[d];
|
|
|
|
auto month = values.month + delta;
|
|
auto year = values.year + (month - 1) / 12;
|
|
month = ((month - 1) % 12) + 1;
|
|
auto day_of_month = saturateDayOfMonth(year, month, values.day_of_month);
|
|
|
|
return makeDayNum(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
|
|
{
|
|
size_t index = findIndex(t);
|
|
const Values & values = lut[index];
|
|
|
|
time_t time_offset = toHour(t) * 3600 + toMinute(t) * 60 + toSecond(t);
|
|
|
|
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);
|
|
|
|
DayNum_t result_day = makeDayNum(year, month, day_of_month);
|
|
|
|
if (time_offset >= lut[result_day].time_at_offset_change)
|
|
time_offset -= lut[result_day].amount_of_offset_change;
|
|
|
|
return lut[result_day].date + time_offset;
|
|
}
|
|
|
|
inline DayNum_t addYears(DayNum_t d, Int64 delta) const
|
|
{
|
|
const Values & values = lut[d];
|
|
|
|
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 makeDayNum(year, month, day_of_month);
|
|
}
|
|
|
|
|
|
inline std::string timeToString(time_t t) const
|
|
{
|
|
const Values & values = find(t);
|
|
|
|
std::string s {"0000-00-00 00:00:00"};
|
|
|
|
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;
|
|
|
|
auto hour = toHour(t);
|
|
auto minute = toMinute(t);
|
|
auto second = toSecond(t);
|
|
|
|
s[11] += hour / 10;
|
|
s[12] += hour % 10;
|
|
s[14] += minute / 10;
|
|
s[15] += minute % 10;
|
|
s[17] += second / 10;
|
|
s[18] += second % 10;
|
|
|
|
return s;
|
|
}
|
|
|
|
inline std::string dateToString(time_t t) const
|
|
{
|
|
const Values & values = find(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(DayNum_t d) const
|
|
{
|
|
const Values & values = lut[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;
|
|
}
|
|
|
|
inline bool isOffsetWholeNumberOfHoursEveryTime() const { return offset_is_whole_number_of_hours_everytime; }
|
|
};
|