1Calendar::Simple(3) User Contributed Perl Documentation Calendar::Simple(3)
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6 Calendar::Simple - Perl extension to create simple calendars
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9 use Calendar::Simple;
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11 my @curr = calendar; # get current month
12 my @this_sept = calendar(9); # get 9th month of current year
13 my @sept_2002 = calendar(9, 2002); # get 9th month of 2002
14 my @monday = calendar(9, 2002, 1); # get 9th month of 2002,
15 # weeks start on Monday
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17 my @span = date_span(mon => 10, # returns span of dates
18 year => 2006,
19 begin => 15,
20 end => 28);
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23 A very simple module that exports one function called "calendar".
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25 calendar
26 This function returns a data structure representing the dates in a
27 month. The data structure returned is an array of array references.
28 The first level array represents the weeks in the month. The second
29 level array contains the actual days. By default, each week starts on a
30 Sunday and the value in the array is the date of that day. Any days at
31 the beginning of the first week or the end of the last week that are
32 from the previous or next month have the value "undef".
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34 If the month or year parameters are omitted then the current month or
35 year are assumed.
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37 A third, optional parameter, start_day, allows you to set the day each
38 week starts with, with the same values as localtime sets for wday
39 (namely, 0 for Sunday, 1 for Monday and so on).
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41 date_span
42 This function returns a cut-down version of a month data structure
43 which begins and ends on dates other than the first and last dates of
44 the month. Any weeks that fall completely outside of the date range
45 are removed from the structure and any days within the remaining weeks
46 that fall outside of the date range are set to "undef".
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48 As there are a number of parameters to this function, they are passed
49 using a named parameter interface. The parameters are as follows:
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51 year
52 The required year. Defaults to the current year if omitted.
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54 mon The required month. Defaults to the current month if omitted.
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56 begin
57 The first day of the required span. Defaults to the first if
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60 end The last day of the required span. Defaults to the last day of the
61 month if omitted.
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63 start_day
64 Indicates the day of the week that each week starts with. This
65 takes the same values as the optional third parameter to
66 "calendar". The default is 1 (for Monday).
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68 NOTE: As of version 2.0.0, the default "start_day" has changed.
69 Previously, it was Sunday; now, it is Monday. This is so the
70 default behaviour matches that of the standard Unix "cal" command.
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72 This function isn't exported by default, so in order to use it in your
73 program you need to use the module like this:
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75 use Calendar::Simple 'date_span';
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77 EXAMPLE
78 A simple "cal" replacement would therefore look like this:
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80 #!/usr/bin/perl
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82 use strict;
83 use warnings;
84 use Calendar::Simple;
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86 my @months = qw(January February March April May June July August
87 September October November December);
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89 my $mon = shift || (localtime)[4] + 1;
90 my $yr = shift || (localtime)[5] + 1900;
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92 my @month = calendar($mon, $yr);
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94 print "\n$months[$mon -1] $yr\n\n";
95 print "Su Mo Tu We Th Fr Sa\n";
96 foreach (@month) {
97 print map { $_ ? sprintf "%2d ", $_ : ' ' } @$_;
98 print "\n";
99 }
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101 A version of this example, called "pcal", is installed when you install
102 this module.
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104 Date Range
105 This module will make use of DateTime if it is installed. By using
106 DateTime it can use any date that "DateTime" can represent. If DateTime
107 is not installed it uses Perl's built-in date handling and therefore
108 can't deal with dates before 1970 and it will also have problems with
109 dates after 2038 on a 32-bit machine.
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111 EXPORT
112 "calendar"
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115 Dave Cross <dave@mag-sol.com>
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118 With thanks to Paul Mison <cpan@husk.org> for the start day patch.
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121 Copyright (C) 2002-2008, Magnum Solutions Ltd. All Rights Reserved.
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124 This script is free software; you can redistribute it and/or modify it
125 under the same terms as Perl itself.
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128 perl, localtime, DateTime
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132perl v5.36.0 2022-07-22 Calendar::Simple(3)