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Manual Reference Pages  -  DATE::EXTRACT (3)

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Date::Extract - extract probable dates from strings



    my $parser = Date::Extract->new();
    my $dt = $parser->extract($arbitrary_text)
        or die "No date found.";
    return $dt->ymd;


There are already a few modules for getting a date out of a string. DateTime::Format::Natural should be your first choice. There’s also Time::ParseDate which fits many formats. Finally, you can coerce Date::Manip to do your bidding.

But I needed something that will take an arbitrary block of text, search it for something that looks like a date string, and extract it. This module fills this niche. By design it will produce few false positives. This means it will not catch nearly everything that looks like a date string. So if you have the string do homework for class 2019 it won’t return a DateTime object with the year set to 2019. This is what your users would probably expect.


new PARAMHASH => CWDate::Extract

format Choose what format the extracted date(s) will be. The default is DateTime, which will return DateTime object(s). Other option include verbatim (return the original text), or epoch (return Unix timestamp).
time_zone Only relevant when C,format> is set to DateTime.

Forces a particular time zone to be set (this actually matters, as tomorrow on Monday at 11 PM means something different than tomorrow on Tuesday at 1 AM).

By default it will use the floating time zone. See the documentation for DateTime.

This controls both the input time zone and output time zone.

prefers This argument decides what happens when an ambiguous date appears in the input. For example, Friday may refer to any number of Fridays. The valid options for this argument are:
nearest Prefer the nearest date. This is the default.
future Prefer the closest future date.
past Prefer the closest past date. <B>NOT YET SUPPORTEDB>.
returns If the text has multiple possible dates, then this argument determines which date will be returned. By default it’s ’first’.
first Returns the first date found in the string.
last Returns the final date found in the string.
earliest Returns the date found in the string that chronologically precedes any other date in the string.
latest Returns the date found in the string that chronologically follows any other date in the string.
all Returns all dates found in the string, in the order they were found in the string.
all_cron Returns all dates found in the string, in chronological order.

    extract text, ARGS => dates

Takes an arbitrary amount of text and extracts one or more dates from it. The return value will be zero or more dates, which by default are DateTime objects (but can be customized with the format argument). If called in scalar context, only one will be returned, even if the returns argument specifies multiple possible return values.

See the documentation of new for the configuration of this method. Any arguments passed into this method will trump those from the constructor.

You may reuse a parser for multiple calls to extract.

You do not need to have an instantiated Date::Extract object to call this method. Just Date::Extract->extract($foo) will work.


o today; tomorrow; yesterday
o last Friday; next Monday; previous Sat
o Monday; Mon
o November 13th, 1986; Nov 13, 1986
o 13 November 1986; 13 Nov 1986
o November 13th; Nov 13
o 13 Nov; 13th November
o 1986/11/13; 1986-11-13
o 11-13-86; 11/13/1986


This module is intentionally very simple. Surprises are not welcome here.


DateTime::Format::Natural, Time::ParseDate, Date::Manip


Shawn M Moore, <sartak at bestpractical dot com>


Thanks to Steven Schubiger for writing the fine DateTime::Format::Natural. We still use it, but it doesn’t quite fill all the particular needs we have.


Copyright 2007-2009 Best Practical Solutions.

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

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perl v5.20.3 DATE::EXTRACT (3) 2014-06-05

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