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# Copyright (c) 1995-2009 Graham Barr. This program is free
# software; you can redistribute it and/or modify it under the same terms
# as Perl itself.
package Date::Parse;
require 5.000;
use strict;
use vars qw($VERSION @ISA @EXPORT);
use Time::Local;
use Carp;
use Time::Zone;
use Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(&strtotime &str2time &strptime);
$VERSION = "2.32";
my %month = (
january => 0,
february => 1,
march => 2,
april => 3,
may => 4,
june => 5,
july => 6,
august => 7,
september => 8,
sept => 8,
october => 9,
november => 10,
december => 11,
);
my %day = (
sunday => 0,
monday => 1,
tuesday => 2,
tues => 2,
wednesday => 3,
wednes => 3,
thursday => 4,
thur => 4,
thurs => 4,
friday => 5,
saturday => 6,
);
my @suf = (qw(th st nd rd th th th th th th)) x 3;
@suf[11,12,13] = qw(th th th);
#Abbreviations
map { $month{substr($_,0,3)} = $month{$_} } keys %month;
map { $day{substr($_,0,3)} = $day{$_} } keys %day;
my $strptime = <<'ESQ';
my %month = map { lc $_ } %$mon_ref;
my $daypat = join("|", map { lc $_ } reverse sort keys %$day_ref);
my $monpat = join("|", reverse sort keys %month);
my $sufpat = join("|", reverse sort map { lc $_ } @$suf_ref);
my %ampm = (
'a' => 0, # AM
'p' => 12, # PM
);
my($AM, $PM) = (0,12);
sub {
my $dtstr = lc shift;
my $merid = 24;
my($century,$year,$month,$day,$hh,$mm,$ss,$zone,$dst,$frac);
$zone = tz_offset(shift) if @_;
1 while $dtstr =~ s#\([^\(\)]*\)# #o;
$dtstr =~ s#(\A|\n|\Z)# #sog;
# ignore day names
$dtstr =~ s#([\d\w\s])[\.\,]\s#$1 #sog;
$dtstr =~ s/,/ /g;
$dtstr =~ s#($daypat)\s*(den\s)?\b# #o;
# Time: 12:00 or 12:00:00 with optional am/pm
return unless $dtstr =~ /\S/;
if ($dtstr =~ s/\s(\d{4})([-:]?)(\d\d?)\2(\d\d?)(?:[-Tt ](\d\d?)(?:([-:]?)(\d\d?)(?:\6(\d\d?)(?:[.,](\d+))?)?)?)?(?=\D)/ /) {
($year,$month,$day,$hh,$mm,$ss,$frac) = ($1,$3-1,$4,$5,$7,$8,$9);
}
unless (defined $hh) {
if ($dtstr =~ s#[:\s](\d\d?):(\d\d?)(:(\d\d?)(?:\.\d+)?)?(z)?\s*(?:([ap])\.?m?\.?)?\s# #o) {
($hh,$mm,$ss) = ($1,$2,$4);
$zone = 0 if $5;
$merid = $ampm{$6} if $6;
}
# Time: 12 am
elsif ($dtstr =~ s#\s(\d\d?)\s*([ap])\.?m?\.?\s# #o) {
($hh,$mm,$ss) = ($1,0,0);
$merid = $ampm{$2};
}
}
if (defined $hh and $hh <= 12 and $dtstr =~ s# ([ap])\.?m?\.?\s# #o) {
$merid = $ampm{$1};
}
unless (defined $year) {
# Date: 12-June-96 (using - . or /)
if ($dtstr =~ s#\s(\d\d?)([\-\./])($monpat)(\2(\d\d+))?\s# #o) {
($month,$day) = ($month{$3},$1);
$year = $5 if $5;
}
# Date: 12-12-96 (using '-', '.' or '/' )
elsif ($dtstr =~ s#\s(\d+)([\-\./])(\d\d?)(\2(\d+))?\s# #o) {
($month,$day) = ($1 - 1,$3);
if ($5) {
$year = $5;
# Possible match for 1995-01-24 (short mainframe date format);
($year,$month,$day) = ($1, $3 - 1, $5) if $month > 12;
return if length($year) > 2 and $year < 1901;
}
}
elsif ($dtstr =~ s#\s(\d+)\s*($sufpat)?\s*($monpat)# #o) {
($month,$day) = ($month{$3},$1);
}
elsif ($dtstr =~ s#($monpat)\s*(\d+)\s*($sufpat)?\s# #o) {
($month,$day) = ($month{$1},$2);
}
elsif ($dtstr =~ s#($monpat)([\/-])(\d+)[\/-]# #o) {
($month,$day) = ($month{$1},$3);
}
# Date: 961212
elsif ($dtstr =~ s#\s(\d\d)(\d\d)(\d\d)\s# #o) {
($year,$month,$day) = ($1,$2-1,$3);
}
$year = $1 if !defined($year) and $dtstr =~ s#\s(\d{2}(\d{2})?)[\s\.,]# #o;
}
# Zone
$dst = 1 if $dtstr =~ s#\bdst\b##o;
if ($dtstr =~ s#\s"?([a-z]{3,4})(dst|\d+[a-z]*|_[a-z]+)?"?\s# #o) {
$dst = 1 if $2 and $2 eq 'dst';
$zone = tz_offset($1);
return unless defined $zone;
}
elsif ($dtstr =~ s#\s([a-z]{3,4})?([\-\+]?)-?(\d\d?):?(\d\d)?(00)?\s# #o) {
my $m = defined($4) ? "$2$4" : 0;
my $h = "$2$3";
$zone = defined($1) ? tz_offset($1) : 0;
return unless defined $zone;
$zone += 60 * ($m + (60 * $h));
}
if ($dtstr =~ /\S/) {
# now for some dumb dates
if ($dtstr =~ s/^\s*(ut?|z)\s*$//) {
$zone = 0;
}
elsif ($dtstr =~ s#\s([a-z]{3,4})?([\-\+]?)-?(\d\d?)(\d\d)?(00)?\s# #o) {
my $m = defined($4) ? "$2$4" : 0;
my $h = "$2$3";
$zone = defined($1) ? tz_offset($1) : 0;
return unless defined $zone;
$zone += 60 * ($m + (60 * $h));
}
return if $dtstr =~ /\S/o;
}
if (defined $hh) {
if ($hh == 12) {
$hh = 0 if $merid == $AM;
}
elsif ($merid == $PM) {
$hh += 12;
}
}
if (defined $year && $year > 1900) {
$century = int($year / 100);
$year -= 1900;
}
$zone += 3600 if defined $zone && $dst;
$ss += "0.$frac" if $frac;
return ($ss,$mm,$hh,$day,$month,$year,$zone,$century);
}
ESQ
use vars qw($day_ref $mon_ref $suf_ref $obj);
sub gen_parser
{
local($day_ref,$mon_ref,$suf_ref,$obj) = @_;
if($obj)
{
my $obj_strptime = $strptime;
substr($obj_strptime,index($strptime,"sub")+6,0) = <<'ESQ';
shift; # package
ESQ
my $sub = eval "$obj_strptime" or die $@;
return $sub;
}
eval "$strptime" or die $@;
}
*strptime = gen_parser(\%day,\%month,\@suf);
sub str2time
{
my @t = strptime(@_);
return undef
unless @t;
my($ss,$mm,$hh,$day,$month,$year,$zone, $century) = @t;
my @lt = localtime(time);
$hh ||= 0;
$mm ||= 0;
$ss ||= 0;
my $frac = $ss - int($ss);
$ss = int $ss;
$month = $lt[4]
unless(defined $month);
$day = $lt[3]
unless(defined $day);
$year = ($month > $lt[4]) ? ($lt[5] - 1) : $lt[5]
unless(defined $year);
# we were given a 4 digit year, so let's keep using those
$year += 1900 if defined $century;
return undef
unless($month <= 11 && $day >= 1 && $day <= 31
&& $hh <= 23 && $mm <= 59 && $ss <= 59);
my $result;
if (defined $zone) {
$result = eval {
local $SIG{__DIE__} = sub {}; # Ick!
timegm($ss,$mm,$hh,$day,$month,$year);
};
return undef
if !defined $result
or $result == -1
&& join("",$ss,$mm,$hh,$day,$month,$year)
ne "595923311169";
$result -= $zone;
}
else {
$result = eval {
local $SIG{__DIE__} = sub {}; # Ick!
timelocal($ss,$mm,$hh,$day,$month,$year);
};
return undef
if !defined $result
or $result == -1
&& join("",$ss,$mm,$hh,$day,$month,$year)
ne join("",(localtime(-1))[0..5]);
}
return $result + $frac;
}
1;
__END__
=head1 NAME
Date::Parse - Parse date strings into time values
=head1 SYNOPSIS
use Date::Parse;
$time = str2time($date);
($ss,$mm,$hh,$day,$month,$year,$zone) = strptime($date);
=head1 DESCRIPTION
C<Date::Parse> provides two routines for parsing date strings into time values.
=over 4
=item str2time(DATE [, ZONE])
C<str2time> parses C<DATE> and returns a unix time value, or undef upon failure.
C<ZONE>, if given, specifies the timezone to assume when parsing if the
date string does not specify a timezone.
=item strptime(DATE [, ZONE])
C<strptime> takes the same arguments as str2time but returns an array of
values C<($ss,$mm,$hh,$day,$month,$year,$zone,$century)>. Elements are only
defined if they could be extracted from the date string. The C<$zone> element
is the timezone offset in seconds from GMT. An empty array is returned upon
failure.
=back
=head1 MULTI-LANGUAGE SUPPORT
Date::Parse is capable of parsing dates in several languages, these include
English, French, German and Italian.
$lang = Date::Language->new('German');
$lang->str2time("25 Jun 1996 21:09:55 +0100");
=head1 EXAMPLE DATES
Below is a sample list of dates that are known to be parsable with Date::Parse
1995:01:24T09:08:17.1823213 ISO-8601
1995-01-24T09:08:17.1823213
Wed, 16 Jun 94 07:29:35 CST Comma and day name are optional
Thu, 13 Oct 94 10:13:13 -0700
Wed, 9 Nov 1994 09:50:32 -0500 (EST) Text in ()'s will be ignored.
21 dec 17:05 Will be parsed in the current time zone
21-dec 17:05
21/dec 17:05
21/dec/93 17:05
1999 10:02:18 "GMT"
16 Nov 94 22:28:20 PST
=head1 LIMITATION
Date::Parse uses L<Time::Local> internally, so is limited to only parsing dates
which result in valid values for Time::Local::timelocal. This generally means dates
between 1901-12-17 00:00:00 GMT and 2038-01-16 23:59:59 GMT
=head1 BUGS
When both the month and the date are specified in the date as numbers
they are always parsed assuming that the month number comes before the
date. This is the usual format used in American dates.
The reason why it is like this and not dynamic is that it must be
deterministic. Several people have suggested using the current locale,
but this will not work as the date being parsed may not be in the format
of the current locale.
My plans to address this, which will be in a future release, is to allow
the programmer to state what order they want these values parsed in.
=head1 AUTHOR
Graham Barr <gbarr@pobox.com>
=head1 COPYRIGHT
Copyright (c) 1995-2009 Graham Barr. This program is free
software; you can redistribute it and/or modify it under the same terms
as Perl itself.
=cut
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