2 # This file is part of Koha.
4 # Koha is free software; you can redistribute it and/or modify it under the
5 # terms of the GNU General Public License as published by the Free Software
6 # Foundation; either version 2 of the License, or (at your option) any later
9 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
10 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11 # A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13 # You should have received a copy of the GNU General Public License along with
14 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
15 # Suite 330, Boston, MA 02111-1307 USA
22 use POSIX qw(strftime);
23 use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
27 @EXPORT_OK = qw(DHTMLcalendar);
29 my $prefformat = C4::Context->preference('dateformat');
30 my $debug = $ENV{'DEBUG'} || 0;
36 metric => 'dd/mm/yyyy',
38 sql => 'yyyymmdd HHMMSS',
41 iso => '%Y-%m-%d', # or %F, "Full Date"
44 sql => '%Y%m%d %H%M%S',
47 our %dmy_subs = ( # strings to eval (after using regular expression returned by regexp below)
48 # make arrays for POSIX::strftime()
49 iso => '[(0,0,0,$3, $2 - 1, $1 - 1900)]',
50 metric => '[(0,0,0,$1, $2 - 1, $3 - 1900)]',
51 us => '[(0,0,0,$2, $1 - 1, $3 - 1900)]',
52 sql => '[(($6||0),($5||0),($4||0),$3, $2 - 1, $1 - 1900)]',
57 my $delim = qr/:?\:|\/|-/; # "non memory" cluster: no backreference
58 my $format = (@_) ? shift : $self->{'dateformat'}; # w/o arg. relies on dateformat being defined
59 ($format eq 'sql') and
60 return qr/^(\d{4})(\d{2})(\d{2})(?:\s{4}(\d{2})(\d{2})(\d{2}))?/;
61 ($format eq 'iso') and
62 return qr/^(\d{4})$delim(\d{2})$delim(\d{2})(?:\s{1}(\d{2})\:?(\d{2})\:?(\d{2}))?/;
63 return qr/^(\d{2})$delim(\d{2})$delim(\d{4})(?:\s{1}(\d{2})\:?(\d{2})\:?(\d{2}))?/; # everything else
68 my $val = shift or return undef;
69 my $dformat = $self->{'dateformat'} or return undef;
70 my $re = $self->regexp();
71 my $xsub = $dmy_subs{$dformat};
72 $debug and print STDERR "xsub: $xsub \n";
74 my $aref = eval $xsub;
77 $debug and carp "Illegal Date '$val' does not match $dformat format: $re\n";
83 my $class = ref($this) || $this;
86 return $self->init(@_);
91 $self->{'dateformat'} = $dformat = (scalar(@_) >= 2) ? $_[1] : $prefformat;
92 ($format_map{$dformat}) or croak
93 "Invalid date format '$dformat' from " . ((scalar(@_) >= 2) ? 'argument' : 'system preferences');
94 # scalar(@self::dmy_array) and croak "\$self is " . ref($self) . "\n\@self::dmy_array already populated: @self::dmy_array";
95 @self::dmy_array = ((@_) ? $self->dmy_map(shift) : localtime);
96 $debug and print STDERR "(during init) \@self::dmy_array = (@self::dmy_array)\n"; #debug
101 my $newformat = (@_) ? _recognize_format(shift) : $self->{'dateformat'} ;
102 return (eval {POSIX::strftime($posix_map{$newformat}, @self::dmy_array)} || undef);
104 sub today ($;$) { # NOTE: sets date value to today (and returns it in the requested or current format)
106 $class = ref($class) || $class;
107 my $format = (@_) ? _recognize_format(shift) : $prefformat;
108 return $class->new()->output($format);
110 sub _recognize_format($) {
111 my $incoming = shift;
112 ($incoming eq 'syspref') and return $prefformat;
113 (scalar grep (/^$incoming$/, keys %format_map) == 1) or croak "The format you asked for ('$incoming') in unrecognized.";
116 sub DHTMLcalendar ($;$) { # interface to posix_map
118 my $format = (@_) ? shift : $prefformat;
119 return $posix_map{$format};
121 sub format { # get or set dateformat: iso, metric, us, etc.
123 (@_) or return $self->{'dateformat'};
124 $self->{'dateformat'} = _recognize_format(shift);
129 return $format_map{ _recognize_format(shift) };
131 $self eq __PACKAGE__ and return $format_map{$prefformat};
132 return $format_map{ eval { $self->{'dateformat'} } || $prefformat} ;
138 =head1 C4::Dates.pm - a more object-oriented replacement for Date.pm.
140 The core problem to address is the multiplicity of formats used by different Koha
141 installations around the world. We needed to move away from any hard-coded values at
142 the script level, for example in initial form values or checks for min/max date. The
143 reason is clear when you consider string '07/01/2004'. Depending on the format, it
144 represents July 1st (us), or January 7th (metric), or an invalid value (iso).
146 =head2 ->new([string_date,][date_format])
148 Arguments to new() are optional. If string_date is not supplied, the present system date is
149 used. If date_format is not supplied, the system preference from C4::Context is used.
153 my $now = C4::Dates->new();
154 my $date1 = C4::Dates->new("09-21-1989","us");
155 my $date2 = C4::Dates->new("19890921 143907","sql");
157 =head2 ->output([date_format])
159 The date value is stored independent of any specific format. Therefore any format can be
160 invoked when displaying it.
162 my $date = C4::Dates->new(); # say today is July 12th, 2010
163 print $date->output("iso"); # prints "2010-07-12"
165 print $date->output("metric"); # prints "12-07-2007"
167 However, it is still necessary to know the format of any incoming date value (e.g.,
168 setting the value of an object with new()). Like new(), output() assumes the system preference
169 date format unless otherwise instructed.
171 =head2 ->format([date_format])
173 With no argument, format returns the object's current date_format. Otherwise it attempts to
174 set the object format to the supplied value.
176 Some previously desireable functions are now unnecessary. For example, you might want a
177 method/function to tell you whether or not a Dates.pm object is of the 'iso' type. But you
178 can see by this example that such a test is trivial to accomplish, and not necessary to
179 include in the module:
183 return ($self->format() eq "iso");
186 Note: A similar function would need to be included for each format.
188 Instead a dependent script can retrieve the format of the object directly and decide what to
189 do with it from there:
191 my $date = C4::Dates->new();
192 my $format = $date->format();
193 ($format eq "iso") or do_something($date);
195 Or if you just want to print a given value and format, no problem:
197 my $date = C4::Dates->new("1989-09-21", "iso");
202 print C4::Dates->new("1989-09-21", "iso")->output;
206 print C4::Dates->new("21-09-1989", "metric")->output("iso");
208 =head2 "syspref" -- System Preference(s)
210 Perhaps you want to force data obtained in a known format to display according to the user's system
211 preference, without necessarily knowing what that preference is. For this purpose, you can use the
212 psuedo-format argument "syspref".
214 For example, to print an ISO date (from the database) in the <systempreference> format:
216 my $date = C4::Dates->new($date_from_database,"iso");
217 my $datestring_for_display = $date->display("syspref");
218 print $datestring_for_display;
222 print C4::Dates->new($date_from_database,"iso")->display("syspref");
224 If you just want to know what the <systempreferece> is, you can use:
228 =head2 ->DHMTLcalendar([date_format])
230 Returns the format string for DHTML Calendar Display based on date_format.
231 If date_format is not supplied, the return is based on system preference.
233 C4::Dates->DHTMLcalendar(); # e.g., returns "%m/%d/%Y" for 'us' system preference
235 =head3 Error Handling
237 Some error handling is provided in this module, but not all. Requesting an unknown format is a
238 fatal error (because it is programmer error, not user error, typically).
240 Scripts must still perform validation of user input. Attempting to set an invalid value will
241 return 0 or undefined, so a script might check as follows:
243 my $date = C4::Dates->new($input) or deal_with_it("$input didn't work");
245 To validate before creating a new object, use the regexp method of the class:
247 $input =~ C4::Dates->regexp("iso") or deal_with_it("input ($input) invalid as iso format");
248 my $date = C4::Dates->new($input,"iso");
250 More verose debugging messages are sent in the presence of non-zero $ENV{"DEBUG"}.
254 If the date format is not in <systempreference>, we should send an error back to the user.
255 This kind of check should be centralized somewhere. Probably not here, though.
257 Notes: if the date in the db is null or empty, interpret null expiration to mean "never expires".