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package Time::Duration::Parse;
$Time::Duration::Parse::VERSION = '0.11';
use 5.006;
use strict;
use warnings;
use Carp;
use Exporter::Lite;
our @EXPORT = qw( parse_duration );
# This map is taken from Cache and Cache::Cache
# map of expiration formats to their respective time in seconds
my %Units = ( map(($_, 1), qw(s second seconds sec secs)),
map(($_, 60), qw(m minute minutes min mins)),
map(($_, 60*60), qw(h hr hour hours)),
map(($_, 60*60*24), qw(d day days)),
map(($_, 60*60*24*7), qw(w week weeks)),
map(($_, 60*60*24*30), qw(M month months)),
map(($_, 60*60*24*365), qw(y year years)) );
sub parse_duration {
my $timespec = shift;
# You can have an optional leading '+', which has no effect
$timespec =~ s/^\s*\+\s*//;
# Treat a plain number as a number of seconds (and parse it later)
if ($timespec =~ /^\s*(-?\d+(?:[.,]\d+)?)\s*$/) {
$timespec = "$1s";
# Convert hh:mm(:ss)? to something we understand
$timespec =~ s/\b(\d+):(\d\d):(\d\d)\b/$1h $2m $3s/g;
$timespec =~ s/\b(\d+):(\d\d)\b/$1h $2m/g;
my $duration = 0;
while ($timespec =~ s/^\s*(-?\d+(?:[.,]\d+)?)\s*([a-zA-Z]+)(?:\s*(?:,|and)\s*)*//i) {
my($amount, $unit) = ($1, $2);
$unit = lc($unit) unless length($unit) == 1;
if (my $value = $Units{$unit}) {
$amount =~ s/,/./;
$duration += $amount * $value;
} else {
Carp::croak "Unknown timespec: $1 $2";
if ($timespec =~ /\S/) {
Carp::croak "Unknown timespec: $timespec";
return sprintf "%.0f", $duration;
=head1 NAME
Time::Duration::Parse - Parse string that represents time duration
use Time::Duration::Parse;
my $seconds = parse_duration("2 minutes and 3 seconds"); # 123
Time::Duration::Parse is a module to parse human readable duration
strings like I<2 minutes and 3 seconds> to seconds.
It does the opposite of I<duration_exact> function in Time::Duration
and is roundtrip safe. So, the following is always true.
use Time::Duration::Parse;
use Time::Duration;
my $seconds = int rand 100000;
is( parse_duration(duration_exact($seconds)), $seconds );
=over 4
=item parse_duration
$seconds = parse_duration($string);
Parses duration string and returns seconds. When it encounters an
error in a given string, it dies an exception saying "Unknown
timespec: blah blah blah". This function is exported by default.
=head1 SEE ALSO
L<Time::Duration::Parse::More> has the same interface as this module,
but supports more expressions and memoization.
L<Time::Duration> can be used for the reverse of this module:
given a number of seconds it will provide an English description of
the duration.
L<Time::Duration::Object> provides an OO interface to L<Time::Duration>.
L<Time::Duration::LocaleObject> provides an OO interface to the
C<Time::Duration::??> modules, which provide language-specific versions
of L<Time::Duration>.
L<DateTime::Format::Duration> can be used to parse natural language
descriptions of durations, returning an instance of L<DateTime::Duration>,
which can then be converted to seconds using the C<in_units()> method.
=head1 AUTHOR
Tatsuhiko Miyagawa E<lt>miyagawa@bulknews.netE<gt>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
Some internal code is taken from Cache and Cache::Cache modules on