NAME `Time::timegm' - a UTC version of `mktime()' SYNOPSIS use Time::timegm qw( timegm ); my $epoch = timegm( 0, 0, 0, 14, 6-1, 2012-1900 ); print "2012-06-14 00:00:00 UTC happened at ", scalar localtime($epoch), " localtime\n"; DESCRIPTION The POSIX standard provides three functions for converting between integer epoch values and 6-component "broken-down" time representations. `localtime' and `gmtime' convert an epoch into the 6 components of seconds, minutes, hours, day of month, month and year, in either local timezone or UTC. The `mktime' function converts a local broken-down time into an epoch value. However, `POSIX' does not provide a UTC version of this. This module provides a function `timegm' which has this ability. Unlike some other CPAN implementations of this behaviour, this version does not re-implement the time handling logic internally. It reuses the `mktime' and `gmtime' functions provided by the system to ensure its results are always consistent with the other functions. FUNCTIONS $epoch = timegm( $sec, $min, $hour, $mday, $mon, $year ) Returns the epoch integer value representing the time given by the 6 broken-down components. As with `POSIX::mktime' it is *not* required that these values be within their "valid" ranges. This function will normalise values out of range. For example, the 25th hour of a day is normalised to the 1st hour of the following day; or the 0th month is normalised to the 12th month of the preceeding year. COMPARISON WITH Time::Local The Time::Local module also provides a function called `timegm()' with similar behaviour to this one. The differences are: * `Time::timegm::timegm()' handles denormalised values (that is, seconds or minutes outside of the range 0 to 59, hours outside 0 to 23, etc..) by adjusting the next largest unit (such that 61 seconds is 1 second of the next minute, etc). `Time::Local::timegm()' croaks on out-of-range input. `Time::Local' also provides a function `timegm_nocheck()' which does not croak but it is documented that the behavior is unspecified on out-of-range values. * `Time::timegm::timegm()' is implemented by a light XS wrapper around the `timegm(3)' or `_mkgmtime(3)' function provided by the platform's C library if such a function is provided, so its behaviour is consistent with the rest of the platform. `Time::Local' re-implements the logic in perl code. `Time::timegm' will fall back to a perl implementation only if the XS one cannot be used. AUTHOR Paul Evans