Date::Parse - Parse date strings into time values

	use Date::Parse;

	$time = str2time($date);

	($ss,$mm,$hh,$day,$month,$year,$zone) = strptime($date);

	$lang = Date::Language->new('German');
	$lang->str2time("25 Jun 1996 21:09:55 +0100");

 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 

# 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 = "2.30";

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($year,$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;
    }
  }

  $year -= 1900 if defined $year && $year > 1900;

  $zone += 3600 if defined $zone && $dst;
  $ss += "0.$frac" if $frac;

  return ($ss,$mm,$hh,$day,$month,$year,$zone);
}
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) = @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);

 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__