Pedro Melo


Time::Duration::Parse::More - parse natural language time duration expressions


version 0.005


    use Time::Duration::Parse::More;

    my ($seconds);
    $seconds = parse_duration('1 minute, 30 seconds'); ## 90
    $seconds = parse_duration('1 minute plus 15 seconds'); ## 75
    $seconds = parse_duration('1 minute minus 15 seconds'); ## 45
    $seconds = parse_duration('1 day minus 2.5 hours and 10 minutes plus 15 seconds'); ## 76815
    $seconds = parse_duration('minus 15 seconds'); ## -15
    $seconds = parse_duration('midnight'); ## it depends :)


The module parses a limited set of natural language expressions and converts them into seconds.

It is backwards compatible with Time::Duration::Parse (passes the same test cases), but adds more expressions and memoization.

At the moment, the module is limited to english language expressions.


The following rules are used to parse the expressions:

  • horizantal white-space, commas and the token and are ignored;

  • an expresion in the form N factor is translated to N * factor_in_seconds. factor is optional, defaults to seconds. Negative and fractional values of N are suported. Singular, plural and single letter versions of factor are understood. All are case-insensitive except the single letter versions;

  • expressions in the form hh:mm:ss, hh:mm, and XhYmZs (any order, all parts optional) are also supported;

  • the tokens plus or minus change the signal of the expressions that follow them;

  • the final value is the sum of all the expressions taking in account the sign defined by the previous rule.

The hard-coded 'midnight' expression is also understood and returns the number of seconds up to 00::00:00 of the next day.


The following factors are understood, with the corresponding value in seconds between parentesis:

  • seconds (1): s, second, seconds, sec, and secs;

  • minutes (60): m, minute, minutes, min, and mins;

  • hours (60 * minutes factor): h, hr, hour, and hours;

  • days (24 * hours factor): d, day, and days;

  • weeks (7 * days factor): w, week, and weeks;

  • months (30 * days factor): M (note the case), month and months;

  • years (365 * days factor): y, year, and years;



    $seconds = parse_duration($expression);

Given an $expression in natural lanaguage returns the number of seconds it represents. This result, with the exception of the 'midnight' expression, is cached so future calls with the same expression will be faster.

If the expression cannot be parsed, parse_duration will croak.


Same as "parse_duration", but the result will not be cached.


This module started as a private module for a closed-source project. I started to release it as Time::Delta when I discovered Time::Duration::Parse. I updated the API to match it, and added my own improvements. This is the result.


Time::Duration::Parse and Time::Duration.



You can find documentation for this module with the perldoc command.

  perldoc Time::Duration::Parse::More


The following websites have more information about this module, and may be of help to you. As always, in addition to those websites please use your favorite search engine to discover more resources.


You can email the author of this module at MELO at asking for help with any problems you have.

Bugs / Feature Requests

Please report any bugs or feature requests through the web interface at You will be automatically notified of any progress on the request by the system.

Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :)

  git clone git://


Stole test cases and other small tidbits from Miyagawa's Time::Duration::Parse.


Pedro Melo <>


This software is Copyright (c) 2013 by Pedro Melo.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)