Provided by: libdatetime-format-iso8601-perl_0.16-1_all 
NAME
DateTime::Format::ISO8601 - Parses ISO8601 formats
VERSION
version 0.16
SYNOPSIS
use DateTime::Format::ISO8601;
my $datetime_str = '2020-07-25T11:32:31';
my $dt = DateTime::Format::ISO8601->parse_datetime($datetime_str);
say $dt;
# This format is ambiguous and could be either a date or time, so use the
# parse_time method.
my $time_str = '113231';
$dt = DateTime::Format::ISO8601->parse_time($time_str);
say $dt;
# or
my $iso8601 = DateTime::Format::ISO8601->new;
$dt = $iso8601->parse_datetime($datetime_str);
say $dt;
$dt = $iso8601->parse_time($time_str);
say $dt;
say DateTime::Format::ISO8601->format_datetime($dt);
DESCRIPTION
Parses almost all ISO8601 date and time formats. ISO8601 time-intervals will be supported
in a later release.
METHODS
This class provides the following methods:
Constructors
DateTime::Format::ISO8601->new( ... )
Accepts an optional hash.
my $iso8601 = DateTime::Format::ISO8601->new(
base_datetime => $dt,
cut_off_year => 42,
legacy_year => 1,
);
• base_datetime
A "DateTime" object that will be used to fill in missing information from incomplete
date/time formats.
This key is optional.
• cut_off_year
A integer representing the cut-off point between interpreting 2-digits years as 19xx
or 20xx.
2-digit years < cut_off_year will be interpreted as 20xx
2-digit years >= cut_off_year will be untreated as 19xx
This key defaults to the value of "DefaultCutOffYear".
• legacy_year
A boolean value controlling if a 2-digit year is interpreted as being in the current
century (unless a "base_datetime" is set) or if "cut_off_year" should be used to place
the year in either 20xx or 19xx.
If this is true, then the "cut_off_year" is used. If this is false, then the year is
always interpreted as being in the current century.
This key defaults to the value of "DefaultLegacyYear".
$iso8601->clone
Returns a replica of the given object.
Object Methods
$iso8601->base_datetime
Returns a "DateTime" object if a "base_datetime" has been set.
$iso8601->set_base_datetime( object => $object )
Accepts a "DateTime" object that will be used to fill in missing information from
incomplete date/time formats.
$iso8601->cut_off_year
Returns a integer representing the cut-off point between interpreting 2-digits years as
19xx or 20xx.
$iso8601->set_cut_off_year($int)
Accepts a integer representing the cut-off point between interpreting 2-digits years as
19xx or 20xx.
2-digit years < legacy_year will be interpreted as 20xx
2-digit years >= legacy_year will be interpreted as 19xx
$iso8601->legacy_year
Returns a boolean value indicating the 2-digit year handling behavior.
$iso8601->set_legacy_year($bool)
Accepts a boolean value controlling if a 2-digit year is interpreted as being in the
current century (unless a "base_datetime" is set) or if "cut_off_year" should be used to
place the year in either 20xx or 19xx.
Class Methods
DateTime::Format::ISO8601->DefaultCutOffYear($int)
Accepts a integer representing the cut-off point for 2-digit years when calling "parse_*"
as class methods and the default value for "cut_off_year" when creating objects. If called
with no parameters this method will return the default value for "cut_off_year".
DateTime::Format::ISO8601->DefaultLegacyYear($bool)
Accepts a boolean value controlling the legacy year behavior when calling "parse_*" as
class methods and the default value for "legacy_year" when creating objects. If called
with no parameters this method will return the default value for "legacy_year".
Parser(s)
These methods may be called as either class or object methods.
parse_datetime
parse_time
Please see the "FORMATS" section.
Formatter
This may be called as either class or object method.
format_datetime($dt)
Formats the datetime in an ISO8601-compatible format. This differs from "iso8601" in
DateTime by including nanoseconds/milliseconds and the correct timezone offset.
FORMATS
There are 6 strings that can match against date only or time only formats. The
"parse_datetime" method will attempt to match these ambiguous strings against date only
formats. If you want to match against the time only formats use the "parse_time" method.
Conventions
• Expanded ISO8601
These formats are supported with exactly 6 digits for the year. Support for a variable
number of digits will be in a later release.
• Precision
If a format doesn't include a year all larger time unit up to and including the year
are filled in using the current date/time or [if set] the "base_datetime" object.
• Fractional time
There is no limit on the expressed precision.
Supported via parse_datetime
The supported formats are listed by the section of ISO 8601:2000(E) in which they appear.
5.2 Dates
• 5.2.1.1
YYYYMMDD
YYYY-MM-DD
• 5.2.1.2
YYYY-MM
YYYY
YY
• 5.2.1.3
YYMMDD
YY-MM-DD
-YYMM
-YY-MM
-YY
--MMDD
--MM-DD
--MM
---DD
• 5.2.1.4
+[YY]YYYYMMDD
+[YY]YYYY-MM-DD
+[YY]YYYY-MM
+[YY]YYYY
+[YY]YY
• 5.2.2.1
YYYYDDD
YYYY-DDD
• 5.2.2.2
YYDDD
YY-DDD
-DDD
• 5.2.2.3
+[YY]YYYYDDD
+[YY]YYYY-DDD
• 5.2.3.1
YYYYWwwD
YYYY-Www-D
• 5.2.3.2
YYYYWww
YYYY-Www
YYWwwD
YY-Www-D
YYWww
YY-Www
-YWwwD
-Y-Www-D
-YWww
-Y-Www
-WwwD
-Www-D
-Www
-W-D
• 5.2.3.4
+[YY]YYYYWwwD
+[YY]YYYY-Www-D
+[YY]YYYYWww
+[YY]YYYY-Www
5.3 Time of Day
• 5.3.1.1 - 5.3.1.3
Values can optionally be prefixed with 'T'.
• 5.3.1.1
hh:mm:ss
• 5.3.1.2
hh:mm
• 5.3.1.3 - 5.3.1.4
fractional (decimal) separator maybe either ',' or '.'
• 5.3.1.3
hhmmss,ss
hh:mm:ss,ss
hhmm,mm
hh:mm,mm
hh,hh
• 5.3.1.4
-mm:ss
-mmss,s
-mm:ss,s
-mm,m
--ss,s
• 5.3.3 - 5.3.4.2
Values can optionally be prefixed with 'T'.
• 5.3.3
hhmmssZ
hh:mm:ssZ
hhmmZ
hh:mmZ
hhZ
hhmmss.ssZ
hh:mm:ss.ssZ
• 5.3.4.2
hhmmss[+-]hhmm
hh:mm:ss[+-]hh:mm
hhmmss[+-]hh
hh:mm:ss[+-]hh
hhmmss.ss[+-]hhmm
hh:mm:ss.ss[+-]hh:mm
5.4 Combinations of date and time of day
• 5.4.1
YYYYMMDDThhmmss
YYYY-MM-DDThh:mm:ss
YYYYMMDDThhmmssZ
YYYY-MM-DDThh:mm:ssZ
YYYYMMDDThhmmss[+-]hhmm
YYYY-MM-DDThh:mm:ss[+-]hh:mm
YYYYMMDDThhmmss[+-]hh
YYYY-MM-DDThh:mm:ss[+-]hh
• 5.4.2
YYYYMMDDThhmmss.ss
YYYY-MM-DDThh:mm:ss.ss
YYYYMMDDThhmmss.ss[+-]hh
YYYY-MM-DDThh:mm:ss.ss[+-]hh
YYYYMMDDThhmmss.ss[+-]hhmm
YYYY-MM-DDThh:mm:ss.ss[+-]hh:mm
• 5.4.3
Support for this section is not complete.
YYYYMMDDThhmm
YYYY-MM-DDThh:mm
YYYYMMDDThhmmZ
YYYY-MM-DDThh:mmZ
YYYYDDDThhmm
YYYY-DDDThh:mm
YYYYDDDThhmmZ
YYYY-DDDThh:mmZ
YYYYWwwDThhmm[+-]hhmm
YYYY-Www-DThh:mm[+-]hh
5.5 Time-Intervals
These are not currently supported
Supported via parse_time
5.3.1.1 - 5.3.1.3
Values can optionally be prefixed with 'T'.
• 5.3.1.1
hhmmss
• 5.3.1.2
hhmm
hh
• 5.3.1.4
-mmss
-mm
--ss
STANDARDS DOCUMENT
Title
ISO8601:2000(E)
Data elements and interchange formats - information exchange -
Representation of dates and times
Second edition 2000-12-15
Reference Number
ISO/TC 154 N 362
CREDITS
Iain 'Spoon' Truskett (SPOON) who wrote DateTime::Format::Builder. That has grown into The
Vacuum Energy Powered "Swiss Army" Katana of date and time parsing. This module was
inspired by and conceived in honor of Iain's work.
Tom Phoenix (PHOENIX) and PDX.pm for helping me solve the ISO week conversion bug. Not by
fixing the code but motivation me to fix it so I could participate in a game of "Zendo".
Jonathan Leffler (JOHNL) for reporting a test bug.
Kelly McCauley for a patch to add 8 missing formats.
Alasdair Allan (AALLAN) for complaining about excessive test execution time.
Everyone at the DateTime "Asylum".
SEE ALSO
• DateTime
• DateTime::Format::Builder
SUPPORT
Bugs may be submitted at
<https://github.com/houseabsolute/DateTime-Format-ISO8601/issues>.
I am also usually active on IRC as 'autarch' on "irc://irc.perl.org".
SOURCE
The source code repository for DateTime-Format-ISO8601 can be found at
<https://github.com/houseabsolute/DateTime-Format-ISO8601>.
AUTHORS
• Joshua Hoblitt <josh@hoblitt.com>
• Dave Rolsky <autarch@urth.org>
CONTRIBUTORS
• Doug Bell <doug@preaction.me>
• joe <draxil@gmail.com>
• Liam Widdowson <lbw@telstra.com>
• Thomas Klausner <domm@plix.at>
COPYRIGHT AND LICENSE
This software is copyright (c) 2021 by Joshua Hoblitt.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
The full text of the license can be found in the LICENSE file included with this
distribution.