NAME

       Time::y2038 - Versions of Perl's time functions which work beyond 2038

SYNOPSIS

           use Time::y2038;

           print scalar gmtime 2**52;  # Sat Dec  6 03:48:16 142715360

DESCRIPTION

       On many computers, Perl's time functions will not work past the year 2038.  This is a design fault in the
       underlying C libraries Perl uses.  Time::y2038 provides replacements for those functions which will work
       accurately +/1 142 million years.

       This only imports the functions into your namespace.  To replace it everywhere, see
       Time::y2038::Everywhere.

       Replaces the following functions:

       gmtime()

       See "gmtime" in perlfunc for details.

       localtime()

       See "localtime" in perlfunc for details.

       timegm()

           my $time = timegm($sec, $min, $hour, $month_day, $month, $year);

       The inverse of gmtime(), takes a date and returns the coorsponding $time (number of seconds since
       Midnight, January 1st, 1970 GMT).  All values are the same as gmtime() so $month is 0..11 (January is 0)
       and the $year is years since 1900 (2008 is 108).

           # June 4, 1906 03:02:01 GMT
           my $time = timegm(1, 2, 3, 4, 5, 6);

       timegm() can take two additional arguments which are always ignored.  This lets you feed the results from
       gmtime() back into timegm() without having to strip the arguments off.

       The following is always true:

           timegm(gmtime($time)) == $time;

       timelocal()

           my $time = timelocal($sec, $min, $hour, $mday, $month, $year);
           my $time = timelocal($sec, $min, $hour, $mday, $month, $year, $wday, $yday, $isdst);

       Like timegm(), but interprets the date in the current time zone.

       timelocal() will normally figure out if daylight savings time is in effect, but if $isdst is given this
       will override that check.  This is mostly useful to resolve ambiguous times around "fall back" when the
       hour between 1am and 2am occurs twice.

           # Sun Nov  4 00:59:59 2007
           print timelocal(59, 59, 0, 4, 10, 107);  # 1194163199

           # Sun Nov  4 01:00:00 2007 DST, one second later
           print timelocal(0, 0, 1, 4, 10, 107, undef, undef, 1);  # 1194163200

           # Sun Nov  4 01:00:00 2007 no DST, one hour later
           print timelocal(0, 0, 1, 4, 10, 107, undef, undef, 0);  # 1194166800

       $wday and $yday are ignored.  They are only there for compatibility with the return value of localtime().

LIMITATIONS

       The safe range of times is +/ 2**52 (about 142 million years).

       Although the underlying time library can handle times from -2**63 to 2**63-1 (about +/- 292 billion
       years) Perl uses floating point numbers internally and so accuracy degrates after 2**52.

BUGS & FEEDBACK

       See http://rt.cpan.org/Dist/Display.html?Queue=Time-y2038 to report and view bugs.

       If you like the module, please drop the author an email.

       The latest version of this module can be found at http://y2038.googlecode.com/ and the repository is at
       http://y2038.googlecode.com/svn/trunk/ in perl/Time-y2038.  You have to check out the whole repository
       because there are symlinks.

AUTHOR

       Michael G Schwern <schwern@pobox.com>

LICENSE & COPYRIGHT

       Copyright 2008-2010 Michael G Schwern

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

       See http://www.perl.com/perl/misc/Artistic.html

SEE ALSO

       Time::y2038::Everywhere overrides localtime() and gmtime() across the whole program.

       The y2038 project at http://y2038.googlecode.com/

       <http://xkcd.com/376/>

perl v5.38.2                                       2024-03-31                                   Time::y2038(3pm)