Masahiro Nagano > Time-TZOffset-0.03 > Time::TZOffset

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Module Version: 0.03   Source  

NAME ^

Time::TZOffset - Show timezone offset strings like +0900

SYNOPSIS ^

    use Time::TZOffset qw/tzoffset/;

    my @localtime = localtime;
    say tzoffset(@localtime);

DESCRIPTION ^

Time::TZOffset provides tzoffset function that determines timezone offset and shows strings like +0900 This module implemented by XS, it's may be faster than other way to show timezone offset. And also Time::TZOffset is more portable than using POSIX::strftime with %z.

FUNCTION ^

tzoffset(@localtime)

Returns a timezone offset string like +0900

BENCHMARK ^

I did this benchmark on linux.

  use Benchmark qw/:all/;
  use POSIX qw//;
  use Time::Local;
  use Time::TZOffset;
  
  cmpthese(timethese(-1, {
      'posix' => sub {
          POSIX::strftime('%z', @lt);
      },
      'time_local' => sub {
          my $sec = Time::Local::timegm(@lt) - Time::Local::timelocal(@lt);
          sprintf '%+03d%02u', $sec/60/60, $min/60%60;
      },
      'tzoffset' => sub {
          Time::TZOffset::tzoffset(@lt);
      },
  }));
  __END__
  Benchmark: running posix, time_local, tzoffset for at least 1 CPU seconds...
       posix:  1 wallclock secs ( 0.66 usr +  0.39 sys =  1.05 CPU) @ 179442.86/s (n=188415)
  time_local:  1 wallclock secs ( 1.12 usr +  0.16 sys =  1.28 CPU) @ 25846.09/s (n=33083)
    tzoffset:  1 wallclock secs ( 0.75 usr +  0.25 sys =  1.00 CPU) @ 286720.00/s (n=286720)
                 Rate time_local      posix   tzoffset
  time_local  25846/s         --       -86%       -91%
  posix      179443/s       594%         --       -37%
  tzoffset   286720/s      1009%        60%         --

LICENSE ^

Copyright (C) Masahiro Nagano.

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

POSIX::strftime::GNU LICENSE ^

This modules uses POSIX::strftime::GNU's code. POSIX::strftime::GNU's license term is following:

Copyright (c) 2012-2014 Piotr Roszatycki <dexter@cpan.org>.

Format specification is based on strftime(3) manual page which is a part of the Linux man-pages project.

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

See http://dev.perl.org/licenses/artistic.html

AUTHOR ^

Masahiro Nagano <kazeburo@gmail.com>

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