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C#: System.DateTime.Now [19] System.DateTime.UtcNow [20] 100 ns [21] 1 January 0001 to 31 December 9999 CICS: ASKTIME: 1 ms 1 January 1900 COBOL: FUNCTION CURRENT-DATE: 1 s 1 January 1601 Common Lisp (get-universal-time) 1 s 1 January 1900 Delphi date time: 1 ms (floating point) 1 January 1900 Delphi (Embarcadero Technologies) [22] System ...
GPS dates are expressed as a week number and a day-of-week number, with the week number transmitted as a ten-bit value. This means that every 1,024 weeks (about 19.6 years) after Sunday 6 January 1980, (the GPS epoch ), the date resets again to that date; this happened for the first time at 23:59:47 on 21 August 1999, [ 11 ] the second time at ...
converts a time_t value to calendar time expressed as local time mktime: converts calendar time to a time_t value. Constants CLOCKS_PER_SEC: number of processor clock ticks per second TIME_UTC: time base for UTC Types struct tm: broken-down calendar time type: year, month, day, hour, minute, second time_t: arithmetic time type (typically time ...
Many computer systems measure time and date using Unix time, an international standard for digital timekeeping. Unix time is defined as the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 (an arbitrarily chosen time based on the creation of the first Unix system), which has been dubbed the Unix epoch. [6]
The leap year problem (also known as the leap year bug or the leap day bug) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from errors in the calculation of which years are leap years, or from manipulating dates without regard to the difference between leap years and ...
All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...
A distinction is sometimes made between the terms datestamp, timestamp and date-timestamp: Datestamp or DS: A date, for example 2025-02-12 according to ISO 8601; Timestamp or TS: A time of day, for example 10:07:44 using 24-hour clock; Date-timestamp or DTS: Date and time, for example 2025-02-12, 10:07:44
For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.