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The format string used in strftime traces back to at least PWB/UNIX 1.0, released in 1977. Its date system command includes various formatting options. [2] [3] In 1989, the ANSI C standard is released including strftime and other date and time functions. [4]
This template gives the current hour in the given time zone in 24-hour format. It makes use of {{Current hour offset in time zone}} which, unless the dst parameter is used, automatically adjusts the hour according to daylight saving time (DST), if applicable. It also makes use of {{Current minute offset in time zone}}.
Time zone abbreviations for both Standard Time and Daylight Saving Time are shown exactly as they appear in the database. See strftime and its "%Z" field. Some of zone records use 3 or 4 letter abbreviations that are tied to physical time zones, others use numeric UTC offsets.
Many computer systems internally store points in time in Unix time format or some other system time format. The date (Unix) command—internally using the C date and time functions—can be used to convert that internal representation of a point in time to most of the date representations shown here.
The C standard library uses Unix time for all date and time functions, and Unix time is sometimes referred to as time_t, the name of the data type used for timestamps in C and C++. C's Unix time functions are defined as the system time API in the POSIX specification. [15]
To add a new time zone to Module:Time/data, add the appropriate information inside the single quotes. If a property does not apply, leave the quotes empty. The rules for each property are: [''] – (required) the abbreviation of a time zone's standard time; must be lower case; this is the value that will be used in the template's time zone ...
Template:Time, the current date/time Template:Now , shows a sentence with the current date/time Template:TODAY , shows only the current date, in typical dmy form
The Arduino platform provides relative time via the millis() function. This function returns an unsigned 32-bit integer representing "milliseconds since startup", which will roll over every 49 days. By default, this is the only timing source available in the platform and programs need to take special care to handle rollovers. [98]