ClickHouse/base/common/DayNum.h

#pragma once

#include <common/types.h>
#include <common/strong_typedef.h>

/** Represents number of days since 1970-01-01.
  * See DateLUTImpl for usage examples.
  */
STRONG_TYPEDEF(UInt16, DayNum)

/** Represent number of days since 1970-01-01 but in extended range,
 * for dates before 1970-01-01 and after 2105
 */
STRONG_TYPEDEF(Int32, ExtendedDayNum)
Added functions "toISOWeek", "toISOYear", "toStartOfISOYear" [#CLICKHOUSE-3988] 2018-09-17 03:09:56 +00:00			`#pragma once`

Improve CCTZ contrib (#9687) * common/Types.h → common/types.h Also split Core/Defines.h and merge with common/likely.h * Improve cctz contrib * Fix ALWAYS_INLINE and unbundled build * Update Dockerfile from master * Fix test for unbundled library 2020-03-19 10:38:34 +00:00			`#include <common/types.h>`
Added functions "toISOWeek", "toISOYear", "toStartOfISOYear" [#CLICKHOUSE-3988] 2018-09-17 03:09:56 +00:00			`#include <common/strong_typedef.h>`

			`/** Represents number of days since 1970-01-01.`
			`* See DateLUTImpl for usage examples.`
			`*/`
			`STRONG_TYPEDEF(UInt16, DayNum)`
Extended range of DateTime64 to years 1925 - 2238 The Year 1925 is a starting point because most of the timezones switched to saner (mostly 15-minutes based) offsets somewhere during 1924 or before. And that significantly simplifies implementation. 2238 is to simplify arithmetics for sanitizing LUT index access; there are less than 0x1ffff days from 1925. * Extended DateLUTImpl internal LUT to 0x1ffff items, some of which represent negative (pre-1970) time values. As a collateral benefit, Date now correctly supports dates up to 2149 (instead of 2106). * Added a new strong typedef ExtendedDayNum, which represents dates pre-1970 and post 2149. * Functions that used to return DayNum now return ExtendedDayNum. * Refactored DateLUTImpl to untie DayNum from the dual role of being a value and an index (due to negative time). Index is now a different type LUTIndex with explicit conversion functions from DatNum, time_t, and ExtendedDayNum. * Updated DateLUTImpl to properly support values close to epoch start (1970-01-01 00:00), including negative ones. * Reduced resolution of DateLUTImpl::Values::time_at_offset_change to multiple of 15-minutes to allow storing 64-bits of time_t in DateLUTImpl::Value while keeping same size. * Minor performance updates to DateLUTImpl when building month LUT by skipping non-start-of-month days. * Fixed extractTimeZoneFromFunctionArguments to work correctly with DateTime64. * New unit-tests and stateless integration tests for both DateTime and DateTime64. 2020-04-17 13:26:44 +00:00
			`/** Represent number of days since 1970-01-01 but in extended range,`
			`* for dates before 1970-01-01 and after 2105`
			`*/`
			`STRONG_TYPEDEF(Int32, ExtendedDayNum)`