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 format_date_in_iso format_date);
29 my $prefformat = C4::Context->preference('dateformat');
30 my $debug = $ENV{'DEBUG'} || 0;
34 metric => 'dd/mm/yyyy',
36 sql => 'yyyymmdd HHMMSS',
39 iso => '%Y-%m-%d', # or %F, "Full Date"
42 sql => '%Y%m%d %H%M%S',
45 our %dmy_subs = ( # strings to eval (after using regular expression returned by regexp below)
46 # make arrays for POSIX::strftime()
47 iso => '[(0,0,0,$3, $2 - 1, $1 - 1900)]',
48 metric => '[(0,0,0,$1, $2 - 1, $3 - 1900)]',
49 us => '[(0,0,0,$2, $1 - 1, $3 - 1900)]',
50 sql => '[(($6||0),($5||0),($4||0),$3, $2 - 1, $1 - 1900)]',
55 my $delim = qr/:?\:|\/|-/; # "non memory" cluster: no backreference
56 my $format = (@_) ? shift : $self->{'dateformat'}; # w/o arg. relies on dateformat being defined
57 ($format eq 'sql') and
58 return qr/^(\d{4})(\d{2})(\d{2})(?:\s{4}(\d{2})(\d{2})(\d{2}))?/;
59 ($format eq 'iso') and
60 return qr/^(\d{4})$delim(\d{2})$delim(\d{2})(?:\s{1}(\d{2})\:?(\d{2})\:?(\d{2}))?/;
61 return qr/^(\d{2})$delim(\d{2})$delim(\d{4})(?:\s{1}(\d{2})\:?(\d{2})\:?(\d{2}))?/; # everything else
66 my $val = shift or return undef;
67 my $dformat = $self->{'dateformat'} or return undef;
68 my $re = $self->regexp();
69 my $xsub = $dmy_subs{$dformat};
70 $debug and print STDERR "xsub: $xsub \n";
72 my $aref = eval $xsub;
76 carp "Illegal Date '$val' does not match '$dformat' format: " . $self->visual() . "\n";
82 my $class = ref($this) || $this;
85 return $self->init(@_);
90 $self->{'dateformat'} = $dformat = (scalar(@_) >= 2) ? $_[1] : $prefformat;
91 ($format_map{$dformat}) or croak
92 "Invalid date format '$dformat' from " . ((scalar(@_) >= 2) ? 'argument' : 'system preferences');
93 $self->{'dmy_arrayref'} = [((@_) ? $self->dmy_map(shift) : localtime )] ;
94 $debug and print STDERR "(during init) \@\$self->{'dmy_arrayref'}: " . join(' ',@{$self->{'dmy_arrayref'}}) . "\n";
99 my $newformat = (@_) ? _recognize_format(shift) : $prefformat;
100 return (eval {POSIX::strftime($posix_map{$newformat}, @{$self->{'dmy_arrayref'}})} || undef);
102 sub today ($;$) { # NOTE: sets date value to today (and returns it in the requested or current format)
104 $class = ref($class) || $class;
105 my $format = (@_) ? _recognize_format(shift) : $prefformat;
106 return $class->new()->output($format);
108 sub _recognize_format($) {
109 my $incoming = shift;
110 ($incoming eq 'syspref') and return $prefformat;
111 (scalar grep (/^$incoming$/, keys %format_map) == 1) or croak "The format you asked for ('$incoming') is unrecognized.";
114 sub DHTMLcalendar ($;$) { # interface to posix_map
116 my $format = (@_) ? shift : $prefformat;
117 return $posix_map{$format};
119 sub format { # get or set dateformat: iso, metric, us, etc.
121 (@_) or return $self->{'dateformat'};
122 $self->{'dateformat'} = _recognize_format(shift);
127 return $format_map{ _recognize_format(shift) };
129 $self eq __PACKAGE__ and return $format_map{$prefformat};
130 return $format_map{ eval { $self->{'dateformat'} } || $prefformat} ;
133 # like the functions from the old C4::Date.pm
135 return __PACKAGE__ -> new(shift,'iso')->output((@_) ? shift : $prefformat);
137 sub format_date_in_iso {
138 return __PACKAGE__ -> new(shift,$prefformat)->output('iso');
144 =head1 C4::Dates.pm - a more object-oriented replacement for Date.pm.
146 The core problem to address is the multiplicity of formats used by different Koha
147 installations around the world. We needed to move away from any hard-coded values at
148 the script level, for example in initial form values or checks for min/max date. The
149 reason is clear when you consider string '07/01/2004'. Depending on the format, it
150 represents July 1st (us), or January 7th (metric), or an invalid value (iso).
152 =head2 ->new([string_date,][date_format])
154 Arguments to new() are optional. If string_date is not supplied, the present system date is
155 used. If date_format is not supplied, the system preference from C4::Context is used.
159 my $now = C4::Dates->new();
160 my $date1 = C4::Dates->new("09-21-1989","us");
161 my $date2 = C4::Dates->new("19890921 143907","sql");
163 =head2 ->output([date_format])
165 The date value is stored independent of any specific format. Therefore any format can be
166 invoked when displaying it.
168 my $date = C4::Dates->new(); # say today is July 12th, 2010
169 print $date->output("iso"); # prints "2010-07-12"
171 print $date->output("metric"); # prints "12-07-2007"
173 However, it is still necessary to know the format of any incoming date value (e.g.,
174 setting the value of an object with new()). Like new(), output() assumes the system preference
175 date format unless otherwise instructed.
177 =head2 ->format([date_format])
179 With no argument, format returns the object's current date_format. Otherwise it attempts to
180 set the object format to the supplied value.
182 Some previously desireable functions are now unnecessary. For example, you might want a
183 method/function to tell you whether or not a Dates.pm object is of the 'iso' type. But you
184 can see by this example that such a test is trivial to accomplish, and not necessary to
185 include in the module:
189 return ($self->format() eq "iso");
192 Note: A similar function would need to be included for each format.
194 Instead a dependent script can retrieve the format of the object directly and decide what to
195 do with it from there:
197 my $date = C4::Dates->new();
198 my $format = $date->format();
199 ($format eq "iso") or do_something($date);
201 Or if you just want to print a given value and format, no problem:
203 my $date = C4::Dates->new("1989-09-21", "iso");
208 print C4::Dates->new("1989-09-21", "iso")->output;
212 print C4::Dates->new("21-09-1989", "metric")->output("iso");
214 =head2 "syspref" -- System Preference(s)
216 Perhaps you want to force data obtained in a known format to display according to the user's system
217 preference, without necessarily knowing what that preference is. For this purpose, you can use the
218 psuedo-format argument "syspref".
220 For example, to print an ISO date (from the database) in the <systempreference> format:
222 my $date = C4::Dates->new($date_from_database,"iso");
223 my $datestring_for_display = $date->output("syspref");
224 print $datestring_for_display;
228 print C4::Dates->new($date_from_database,"iso")->output("syspref");
230 If you just want to know what the <systempreferece> is, you can use:
234 =head2 ->DHMTLcalendar([date_format])
236 Returns the format string for DHTML Calendar Display based on date_format.
237 If date_format is not supplied, the return is based on system preference.
239 C4::Dates->DHTMLcalendar(); # e.g., returns "%m/%d/%Y" for 'us' system preference
241 =head3 Error Handling
243 Some error handling is provided in this module, but not all. Requesting an unknown format is a
244 fatal error (because it is programmer error, not user error, typically).
246 Scripts must still perform validation of user input. Attempting to set an invalid value will
247 return 0 or undefined, so a script might check as follows:
249 my $date = C4::Dates->new($input) or deal_with_it("$input didn't work");
251 To validate before creating a new object, use the regexp method of the class:
253 $input =~ C4::Dates->regexp("iso") or deal_with_it("input ($input) invalid as iso format");
254 my $date = C4::Dates->new($input,"iso");
256 More verose debugging messages are sent in the presence of non-zero $ENV{"DEBUG"}.
260 If the date format is not in <systempreference>, we should send an error back to the user.
261 This kind of check should be centralized somewhere. Probably not here, though.
263 Notes: if the date in the db is null or empty, interpret null expiration to mean "never expires".