Koha/DateUtils.pm

   1 package Koha::DateUtils;
   2
   3 # Copyright (c) 2011 PTFS-Europe Ltd.
   4 # This file is part of Koha.
   5 #
   6 # Koha is free software; you can redistribute it and/or modify it under the
   7 # terms of the GNU General Public License as published by the Free Software
   8 # Foundation; either version 2 of the License, or (at your option) any later
   9 # version.
  10 #
  11 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  12 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  13 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along with
  16 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  17 # Suite 330, Boston, MA  02111-1307 USA
  18
  19 use strict;
  20 use warnings;
  21 use 5.010;
  22 use DateTime;
  23 use DateTime::Format::DateParse;
  24 use C4::Context;
  25
  26 use base 'Exporter';
  27 use version; our $VERSION = qv('1.0.0');
  28
  29 our @EXPORT = (
  30     qw( dt_from_string output_pref format_sqldatetime output_pref_due format_sqlduedatetime)
  31 );
  32
  33 =head1 DateUtils
  34
  35 Koha::DateUtils - Transitional wrappers to ease use of DateTime
  36
  37 =head1 DESCRIPTION
  38
  39 Koha has historically only used dates not datetimes and been content to
  40 handle these as strings. It also has confused formatting with actual dates
  41 this is a temporary module for wrappers to hide the complexity of switch to DateTime
  42
  43 =cut
  44
  45 =head2 dt_ftom_string
  46
  47 $dt = dt_from_string($date_string, [$format, $timezone ]);
  48
  49 Passed a date string returns a DateTime object format and timezone default
  50 to the system preferences. If the date string is empty DateTime->now is returned
  51
  52 =cut
  53
  54 sub dt_from_string {
  55     my ( $date_string, $date_format, $tz ) = @_;
  56     if ( !$tz ) {
  57         $tz = C4::Context->tz;
  58     }
  59     if ( !$date_format ) {
  60         $date_format = C4::Context->preference('dateformat');
  61     }
  62     if ($date_string) {
  63         if ( ref($date_string) eq 'DateTime' ) {    # already a dt return it
  64             return $date_string;
  65         }
  66
  67         if ( $date_format eq 'metric' ) {
  68             $date_string =~ s#-#/#g;
  69             $date_string =~ s/^00/01/;    # system allows the 0th of the month
  70             $date_string =~ s#^(\d{1,2})/(\d{1,2})#$2/$1#;
  71         } else {
  72             if ( $date_format eq 'iso' ) {
  73                 $date_string =~ s/-00/-01/;
  74                 if ( $date_string =~ m/^0000-0/ ) {
  75                     return;               # invalid date in db
  76                 }
  77             } elsif ( $date_format eq 'us' ) {
  78                 $date_string =~ s#-#/#g;
  79                 $date_string =~ s[/00/][/01/];
  80             } elsif ( $date_format eq 'sql' ) {
  81                 $date_string =~
  82 s/(\d{4})(\d{2})(\d{2})\s+(\d{2})(\d{2})(\d{2})/$1-$2-$3T$4:$5:$6/;
  83                 return if ($date_string =~ /^0000-00-00/);
  84                 $date_string =~ s/00T/01T/;
  85             }
  86         }
  87         return DateTime::Format::DateParse->parse_datetime( $date_string,
  88             $tz->name() );
  89     }
  90     return DateTime->now( time_zone => $tz );
  91
  92 }
  93
  94 =head2 output_pref
  95
  96 $date_string = output_pref($dt, [$format] );
  97
  98 Returns a string containing the time & date formatted as per the C4::Context setting,
  99 or C<undef> if C<undef> was provided.
 100
 101 A second parameter allows overriding of the syspref value. This is for testing only
 102 In usage use the DateTime objects own methods for non standard formatting
 103
 104 A third parameter allows to specify if the output format contains the hours and minutes.
 105 If it is not defined, the default value is 0;
 106
 107 =cut
 108
 109 sub output_pref {
 110     my $dt         = shift;
 111     my $force_pref = shift;         # if testing we want to override Context
 112     my $dateonly   = shift || 0;    # if you don't want the hours and minutes
 113
 114     return unless defined $dt;
 115
 116     my $pref =
 117       defined $force_pref ? $force_pref : C4::Context->preference('dateformat');
 118     given ($pref) {
 119         when (/^iso/) {
 120             return $dateonly
 121                 ? $dt->strftime('%Y-%m-%d')
 122                 : $dt->strftime('%Y-%m-%d %H:%M');
 123         }
 124         when (/^metric/) {
 125             return $dateonly
 126                 ? $dt->strftime('%d/%m/%Y')
 127                 : $dt->strftime('%d/%m/%Y %H:%M');
 128         }
 129         when (/^us/) {
 130             return $dateonly
 131                 ? $dt->strftime('%m/%d/%Y')
 132                 : $dt->strftime('%m/%d/%Y %H:%M');
 133         }
 134         default {
 135             return $dateonly
 136                 ? $dt->strftime('%Y-%m-%d')
 137                 : $dt->strftime('%Y-%m-%d %H:%M');
 138         }
 139
 140     }
 141     return;
 142 }
 143
 144 =head2 output_pref_due
 145
 146 $date_string = output_pref_due($dt, [$format] );
 147
 148 Returns a string containing the time & date formatted as per the C4::Context setting
 149
 150 A second parameter allows overriding of the syspref value. This is for testing only
 151 In usage use the DateTime objects own methods for non standard formatting
 152
 153 This is effectivelyt a wrapper around output_pref for due dates
 154 the time portion is stripped if it is '23:59'
 155
 156 =cut
 157
 158 sub output_pref_due {
 159     my $disp_str = output_pref(@_);
 160     $disp_str =~ s/ 23:59//;
 161     return $disp_str;
 162 }
 163
 164 =head2 format_sqldatetime
 165
 166 $string = format_sqldatetime( $string_as_returned_from_db );
 167
 168 a convenience routine for calling dt_from_string and formatting the result
 169 with output_pref as it is a frequent activity in scripts
 170
 171 =cut
 172
 173 sub format_sqldatetime {
 174     my $str        = shift;
 175     my $force_pref = shift;    # if testing we want to override Context
 176     if ( defined $str && $str =~ m/^\d{4}-\d{2}-\d{2}/ ) {
 177         my $dt = dt_from_string( $str, 'sql' );
 178         return q{} unless $dt;
 179         $dt->truncate( to => 'minute' );
 180         return output_pref( $dt, $force_pref );
 181     }
 182     return q{};
 183 }
 184
 185 =head2 format_sqlduedatetime
 186
 187 $string = format_sqldatetime( $string_as_returned_from_db );
 188
 189 a convenience routine for calling dt_from_string and formatting the result
 190 with output_pref_due as it is a frequent activity in scripts
 191
 192 =cut
 193
 194 sub format_sqlduedatetime {
 195     my $str        = shift;
 196     my $force_pref = shift;    # if testing we want to override Context
 197     if ( defined $str && $str =~ m/^\d{4}-\d{2}-\d{2}/ ) {
 198         my $dt = dt_from_string( $str, 'sql' );
 199         $dt->truncate( to => 'minute' );
 200         return output_pref_due( $dt, $force_pref );
 201     }
 202     return q{};
 203 }
 204
 205 1;