NAME
    Date::Format::ISO8601 - Format date (Unix timestamp/epoch) as ISO8601
    date/time string

VERSION
    This document describes version 0.010 of Date::Format::ISO8601 (from
    Perl distribution Date-Format-ISO8601), released on 2020-10-22.

SYNOPSIS
     use Date::Format::ISO8601 qw(
         gmtime_to_iso8601_date
         gmtime_to_iso8601_time
         gmtime_to_iso8601_datetime

         localtime_to_iso8601_date
         localtime_to_iso8601_time
         localtime_to_iso8601_datetime
     );

     my $timestamp      = 1529780523    ; # Sat Jun 23 19:02:03 2018 GMT
     my $timestamp_frac = 1529780523.456; # Sat Jun 23 19:02:03 2018 GMT

    Assuming local timezone is UTC+7.

    Formatting dates:

     say gmtime_to_iso8601_date   ($timestamp);   # => 2018-06-23
     say localtime_to_iso8601_date($timestamp);   # => 2018-06-24

    Formatting times:

     say gmtime_to_iso8601_time   ($timestamp);            # => 19:02:03Z
     say gmtime_to_iso8601_time   ({tz=>''}, $timestamp);  # => 19:02:03
     say gmtime_to_iso8601_time   ({second_precision=>3}, $timestamp_frac);
                                                           # => 19:02:03.456Z
     say localtime_to_iso8601_time($timestamp);            # => 00:02:03
     say localtime_to_iso8601_time({tz=>'+07:00'}, $timestamp);
                                                           # => 00:02:03+07:00

    Formatting date+time:

     say gmtime_to_iso8601_datetime   ($timestamp);        # => 2018-06-23T19:02:03Z
     say gmtime_to_iso8601_datetime   ({tz=>''}, $timestamp);
                                                           # => 2018-06-23T19:02:03
     say gmtime_to_iso8601_datetime   ({second_precision=>3}, $timestamp_frac);
                                                           # => 2018-06-23T19:02:03.456Z
     say localtime_to_iso8601_datetime($timestamp);        # => 2018-06-24T00:02:03
     say localtime_to_iso8601_datetime({tz=>'+07:00'}, $timestamp);
                                                           # => 2018-06-24T00:02:03+07:00

DESCRIPTION
    This module formats Unix timestamps (epochs) as ISO8601 date/time
    strings. It is a lightweight alternative to
    DateTime::Format::ISO8601::Format and DateTime::Format::ISO8601.

FUNCTIONS
  gmtime_to_iso8601_date
    Usage:

     my $str = gmtime_to_iso8601_date([ \%opts, ] $timestamp);

    Options:

    *   tz

        String. Will be appended after the time portion.

    *   date_sep

        String. Default is colon ("-").

    *   time_sep

        String. Default is colon (":").

    *   second_precision

        Integer. Number of digits for fractional second. Default is undef
        (precision as needed).

  gmtime_to_iso8601_time
    See Synopsis and "gmtime_to_iso8601_date" for syntax and options.

  gmtime_to_iso8601_datetime
    See Synopsis and "gmtime_to_iso8601_date" for syntax and options.

  localtime_to_iso8601_date
    See Synopsis and "gmtime_to_iso8601_date" for syntax and options.

  localtime_to_iso8601_time
    See Synopsis and "gmtime_to_iso8601_date" for syntax and options.

  localtime_to_iso8601_datetime
    See Synopsis and "gmtime_to_iso8601_date" for syntax and options.

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Date-Format-ISO8601>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Date-Format-ISO8601>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Date-Format-ISO8601>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

SEE ALSO
    DateTime::Format::ISO8601::Format

    DateTime::Format::ISO8601

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2020 by perlancar@cpan.org.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.