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Time-FFI-2.001
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 / Time::FFI

NAME

Time::FFI - libffi interface to POSIX date and time functions

SYNOPSIS

  use Time::FFI qw(localtime mktime strptime strftime);

  my $tm = strptime '1995-01-02 13:15:39', '%Y-%m-%d %H:%M:%S';
  my $epoch = mktime $tm;
  print "$epoch: ", strftime('%I:%M:%S %p on %B %e, %Y', $tm);

  my $tm = localtime time;
  my $datetime = $tm->to_object('DateTime', 1);

  my $tm = gmtime time;
  my $moment = $tm->to_object('Time::Moment', 0);

  use Time::FFI::tm;
  my $tm = Time::FFI::tm->from_object(DateTime->now);
  my $epoch = $tm->epoch(1);
  my $piece = $tm->to_object('Time::Piece', 1);

DESCRIPTION

Time::FFI provides a libffi interface to POSIX date and time functions found in time.h.

The "gmtime" and "localtime" functions behave very differently from the core functions of the same name, as well as those exported by Time::Piece, so you may wish to call them as e.g. Time::FFI::gmtime rather than importing them.

All functions will throw an exception in the event of an error. For functions other than "strftime" and "strptime", this exception will contain the syscall error message, and "$!" in perlvar will also have been set by the syscall, so you could check it after trapping the exception for finer exception handling.

FUNCTIONS

All functions are exported individually, or with the :all export tag.

asctime

  my $str = asctime $tm;

Returns a string in the format Wed Jun 30 21:49:08 1993\n representing the passed Time::FFI::tm record. The thread-safe asctime_r(3) function is used if available.

ctime

  my $str = ctime $epoch;
  my $str = ctime;

Returns a string in the format Wed Jun 30 21:49:08 1993\n representing the passed epoch timestamp (defaulting to the current time) in the local time zone. This is equivalent to "ctime" in POSIX but uses the thread-safe ctime_r(3) function if available.

gmtime

  my $tm = gmtime $epoch;
  my $tm = gmtime;

Returns a Time::FFI::tm record representing the passed epoch timestamp (defaulting to the current time) in UTC. The thread-safe gmtime_r(3) function is used if available.

localtime

  my $tm = localtime $epoch;
  my $tm = localtime;

Returns a Time::FFI::tm record representing the passed epoch timestamp (defaulting to the current time) in the local time zone. The thread-safe localtime_r(3) function is used if available.

mktime

  my $epoch = mktime $tm;

Returns the epoch timestamp representing the passed Time::FFI::tm record interpreted in the local time zone. The time is interpreted from the sec, min, hour, mday, mon, year, and isdst members of the record, ignoring the rest. DST status will be automatically determined if isdst is a negative value. The record will also be updated to normalize any out-of-range values and populate the isdst, wday, and yday values, as well as gmtoff and zone if supported.

strftime

  my $str = strftime $format, $tm;

Returns a string formatted according to the passed format string, representing the passed Time::FFI::tm record. Consult your system's strftime(3) manual for available format descriptors.

strptime

  my $tm = strptime $str, $format;
     $tm = strptime $str, $format, $tm;
  my $tm = strptime $str, $format, undef, \my $remaining;
     $tm = strptime $str, $format, $tm, \my $remaining;

Returns a Time::FFI::tm record representing the passed string, parsed according to the passed format. Consult your system's strptime(3) manual for available format descriptors. The isdst value will be set to -1; all other unspecified values will default to 0. Note that the default mday value of 0 is outside of the standard range [1,31] and may cause an error or be interpreted as the last day of the previous month.

A Time::FFI::tm record may be passed as the third argument, in which case it will be modified in place to (on most systems) update only the date/time elements which were parsed from the string. Additionally, an optional scalar reference may be passed as the fourth argument, in which case it will be set to the remaining unprocessed characters of the input string if any.

This function is usually not available on Windows.

timegm

  my $epoch = timegm $tm;

Since version 1.002

Like "mktime", but interprets the passed Time::FFI::tm record as UTC. This function is not always available.

timelocal

  my $epoch = timelocal $tm;

Since version 1.002

The same as "mktime", but not always available.

BUGS

Report any issues on the public bugtracker.

AUTHOR

Dan Book <dbook@cpan.org>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2019 by Dan Book.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)

SEE ALSO

Time::Piece, Time::Moment, DateTime, POSIX, POSIX::strptime