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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.
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 since the Unix epoch) clock_t: process running time type timespec
-- The logic of PHP mktime is followed where m or d can be zero to mean-- the previous unit, and -1 is the one before that, etc.-- Positive values carry forward. local date if not (1 <= m and m <= 12) then date = Date (y, 1, 1) if not date then return end date = date + ((m-1).. 'm') y, m = date. year, date. month end local days_hms if not ...
Closely related to system time is process time, which is a count of the total CPU time consumed by an executing process.It may be split into user and system CPU time, representing the time spent executing user code and system kernel code, respectively.
Background execution allows a shell to run a command without user interaction in the terminal, freeing the command line for additional work with the shell.
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The tz database is published as a set of text files which list the rules and zone transitions in a human-readable format. For use, these text files are compiled into a set of platform-independent binary files—one per timezone.
English: Atmospheric 14 CO 2 in the second half of the 20 th century. The figure shows the 14 C / 12 C ratio relative to the natural level in the atmospheric CO 2 as a function of time in the second half of the 20th century.