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
23 use POSIX qw(strftime);
24 use Date::Calc qw(check_date check_time);
25 use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
26 use vars qw($debug $cgi_debug);
31 @EXPORT_OK = qw(format_date_in_iso format_date);
34 use vars qw($prefformat);
36 unless (defined $prefformat) {
37 $prefformat = C4::Context->preference('dateformat');
43 iso => 'yyyy-mm-dd', # plus " HH:MM:SS"
44 metric => 'dd/mm/yyyy', # plus " HH:MM:SS"
45 us => 'mm/dd/yyyy', # plus " HH:MM:SS"
46 sql => 'yyyymmdd HHMMSS',
49 iso => '%Y-%m-%d', # or %F, "Full Date"
52 sql => '%Y%m%d %H%M%S',
55 our %dmy_subs = ( # strings to eval (after using regular expression returned by regexp below)
56 # make arrays for POSIX::strftime()
57 iso => '[(($6||0),($5||0),($4||0),$3, $2 - 1, $1 - 1900)]',
58 metric => '[(($6||0),($5||0),($4||0),$1, $2 - 1, $3 - 1900)]',
59 us => '[(($6||0),($5||0),($4||0),$2, $1 - 1, $3 - 1900)]',
60 sql => '[(($6||0),($5||0),($4||0),$3, $2 - 1, $1 - 1900)]',
65 my $delim = qr/:?\:|\/|-/; # "non memory" cluster: no backreference
66 my $format = (@_) ? shift : $self->{'dateformat'}; # w/o arg. relies on dateformat being defined
67 ($format eq 'sql') and
68 return qr/^(\d{4})(\d{2})(\d{2})(?:\s{4}(\d{2})(\d{2})(\d{2}))?/;
69 ($format eq 'iso') and
70 return qr/^(\d{4})$delim(\d{2})$delim(\d{2})(?:(?:\s{1}|T)(\d{2})\:?(\d{2})\:?(\d{2}))?Z?/;
71 return qr/^(\d{2})$delim(\d{2})$delim(\d{4})(?:\s{1}(\d{2})\:?(\d{2})\:?(\d{2}))?/; # everything else
76 my $val = shift or return undef;
77 my $dformat = $self->{'dateformat'} or return undef;
78 my $re = $self->regexp();
79 my $xsub = $dmy_subs{$dformat};
80 $debug and print STDERR "xsub: $xsub \n";
82 my $aref = eval $xsub;
83 _check_date_and_time($aref);
87 carp "Illegal Date '$val' does not match '$dformat' format: " . $self->visual();
91 sub _check_date_and_time {
92 my $chron_ref = shift;
93 my ($year, $month, $day) = _chron_to_ymd($chron_ref);
94 unless (check_date($year, $month, $day)) {
95 carp "Illegal date specified (year = $year, month = $month, day = $day)";
97 my ($hour, $minute, $second) = _chron_to_hms($chron_ref);
98 unless (check_time($hour, $minute, $second)) {
99 carp "Illegal time specified (hour = $hour, minute = $minute, second = $second)";
104 my $chron_ref = shift;
105 return ($chron_ref->[5] + 1900, $chron_ref->[4] + 1, $chron_ref->[3]);
109 my $chron_ref = shift;
110 return ($chron_ref->[2], $chron_ref->[1], $chron_ref->[0]);
114 shift; # as clone isn't implemented, we don't carre about package name
115 my $self = bless {}, __PACKAGE__;
120 my ($self,$string_date,$dformat) = @_;
126 $from = 'system preferences';
127 $dformat = _prefformat;
130 $self->{'dateformat'} = $dformat;
131 $format_map{$dformat} or croak "Invalid date format '$dformat' from $from";
133 $self->{'dmy_arrayref'} = $string_date
134 ? $self->dmy_map($string_date)
139 q[(during init) @$self->{'dmy_arrayref'}:]
140 , join(' ',@{$self->{'dmy_arrayref'}})
149 my $newformat = (@_) ? _recognize_format(shift) : _prefformat();
150 return (eval {POSIX::strftime($posix_map{$newformat}, @{$self->{'dmy_arrayref'}})} || undef);
152 sub today ($;$) { # NOTE: sets date value to today (and returns it in the requested or current format)
154 $class = ref($class) || $class;
155 my $format = (@_) ? _recognize_format(shift) : _prefformat();
156 return $class->new()->output($format);
158 sub _recognize_format($) {
159 my $incoming = shift;
160 ($incoming eq 'syspref') and return _prefformat();
161 (scalar grep (/^$incoming$/, keys %format_map) == 1) or croak "The format you asked for ('$incoming') is unrecognized.";
164 sub DHTMLcalendar ($;$) { # interface to posix_map
166 my $format = (@_) ? shift : _prefformat();
167 return $posix_map{$format};
169 sub format { # get or set dateformat: iso, metric, us, etc.
171 (@_) or return $self->{'dateformat'};
172 $self->{'dateformat'} = _recognize_format(shift);
177 return $format_map{ _recognize_format(shift) };
179 $self eq __PACKAGE__ and return $format_map{_prefformat()};
180 return $format_map{ eval { $self->{'dateformat'} } || _prefformat()} ;
183 # like the functions from the old C4::Date.pm
185 return __PACKAGE__ -> new(shift,'iso')->output((@_) ? shift : _prefformat());
187 sub format_date_in_iso {
188 return __PACKAGE__ -> new(shift,_prefformat())->output('iso');
194 =head1 C4::Dates.pm - a more object-oriented replacement for Date.pm.
196 The core problem to address is the multiplicity of formats used by different Koha
197 installations around the world. We needed to move away from any hard-coded values at
198 the script level, for example in initial form values or checks for min/max date. The
199 reason is clear when you consider string '07/01/2004'. Depending on the format, it
200 represents July 1st (us), or January 7th (metric), or an invalid value (iso).
202 The formats supported by Koha are:
203 iso - ISO 8601 (extended)
205 metric - European standard (slight misnomer, not really decimalized metric)
206 sql - log format, not really for human consumption
208 =head2 ->new([string_date,][date_format])
210 Arguments to new() are optional. If string_date is not supplied, the present system date is
211 used. If date_format is not supplied, the system preference from C4::Context is used.
215 my $now = C4::Dates->new();
216 my $date1 = C4::Dates->new("09-21-1989","us");
217 my $date2 = C4::Dates->new("19890921 143907","sql");
219 =head2 ->output([date_format])
221 The date value is stored independent of any specific format. Therefore any format can be
222 invoked when displaying it.
224 my $date = C4::Dates->new(); # say today is July 12th, 2010
225 print $date->output("iso"); # prints "2010-07-12"
227 print $date->output("metric"); # prints "12-07-2010"
229 However, it is still necessary to know the format of any incoming date value (e.g.,
230 setting the value of an object with new()). Like new(), output() assumes the system preference
231 date format unless otherwise instructed.
233 =head2 ->format([date_format])
235 With no argument, format returns the object's current date_format. Otherwise it attempts to
236 set the object format to the supplied value.
238 Some previously desireable functions are now unnecessary. For example, you might want a
239 method/function to tell you whether or not a Dates.pm object is of the 'iso' type. But you
240 can see by this example that such a test is trivial to accomplish, and not necessary to
241 include in the module:
245 return ($self->format() eq "iso");
248 Note: A similar function would need to be included for each format.
250 Instead a dependent script can retrieve the format of the object directly and decide what to
251 do with it from there:
253 my $date = C4::Dates->new();
254 my $format = $date->format();
255 ($format eq "iso") or do_something($date);
257 Or if you just want to print a given value and format, no problem:
259 my $date = C4::Dates->new("1989-09-21", "iso");
264 print C4::Dates->new("1989-09-21", "iso")->output;
268 print C4::Dates->new("21-09-1989", "metric")->output("iso");
270 =head2 "syspref" -- System Preference(s)
272 Perhaps you want to force data obtained in a known format to display according to the user's system
273 preference, without necessarily knowing what that preference is. For this purpose, you can use the
274 psuedo-format argument "syspref".
276 For example, to print an ISO date (from the database) in the <systempreference> format:
278 my $date = C4::Dates->new($date_from_database,"iso");
279 my $datestring_for_display = $date->output("syspref");
280 print $datestring_for_display;
284 print C4::Dates->new($date_from_database,"iso")->output("syspref");
286 If you just want to know what the <systempreferece> is, a default Dates object can tell you:
288 C4::Dates->new()->format();
290 =head2 ->DHMTLcalendar([date_format])
292 Returns the format string for DHTML Calendar Display based on date_format.
293 If date_format is not supplied, the return is based on system preference.
295 C4::Dates->DHTMLcalendar(); # e.g., returns "%m/%d/%Y" for 'us' system preference
297 =head3 Error Handling
299 Some error handling is provided in this module, but not all. Requesting an unknown format is a
300 fatal error (because it is programmer error, not user error, typically).
302 Scripts must still perform validation of user input. Attempting to set an invalid value will
303 return 0 or undefined, so a script might check as follows:
305 my $date = C4::Dates->new($input) or deal_with_it("$input didn't work");
307 To validate before creating a new object, use the regexp method of the class:
309 $input =~ C4::Dates->regexp("iso") or deal_with_it("input ($input) invalid as iso format");
310 my $date = C4::Dates->new($input,"iso");
312 More verbose debugging messages are sent in the presence of non-zero $ENV{"DEBUG"}.
314 Notes: if the date in the db is null or empty, interpret null expiration to mean "never expires".
318 This internal function is used to read the preferred date format
319 from the system preference table. It reads the preference once,
322 This replaces using the package variable $prefformat directly, and
323 specifically, doing a call to C4::Context->preference() during
324 module initialization. That way, C4::Dates no longer has a
325 compile-time dependency on having a valid $dbh.
329 If the date format is not in <systempreference>, we should send an error back to the user.
330 This kind of check should be centralized somewhere. Probably not here, though.