1Handler::Delta(3) User Contributed Perl Documentation Handler::Delta(3)
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6 Date::Handler::Delta - Time lapse object
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9 use Date::Handler::Delta;
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11 my $delta = new Date::Handler::Delta([3,1,10,2,5,5]);
12 my $delta = new Date::Handler::Delta({
13 years => 3,
14 months => 1,
15 days => 10,
16 hours => 2,
17 minutes => 5,
18 seconds => 5,
19 });
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21 $delta->new (More information in perldoc Date::Handler::Delta)
22 $delta->Months() Number of months in delta
23 $delta->Seconds() Number of seconds in delta
24 $delta->AsScalar() "%d months and %d seconds"
25 $delta->AsNumber() "%d-%d-%d"
26 $delta->AsArray() [y,m,ss]
27 $delta->AsHash() { months => m, seconds => ss }
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29 $date + $delta = Date::Handler
30 $date - $delta = Date::Handler
31 $date - $date2 = Date::Handler::Delta
32 $date + n = (+n seconds)
33 $date - n = (-n seconds)
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35 $delta + $delta = Date::Handler::Delta
36 $delta - $delta = Date::Handler::Delta
37 $delta * n = Date::Handler::Delta
38 $delta / n = Date::Handler::Delta
39 $delta + n = (+n seconds)
40 $delta - n = (-n seconds)
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43 Date::Handler::Delta is an object that represents a lapse of time. It's
44 internal representation of a time lapse if reduced to months and
45 seconds. A Date::Handler::Delta object is always relative to a
46 Date::Handler object, it's calculation methods become active when the
47 delta is applied to a date.
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50 Implementation details
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52 Creating a Date::Handler::Delta object
53 The new() constructor receives only one argument as an array reference
54 or hash reference:
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56 my $delta = Date::Handler::Delta->new([1,3,5,0,0]);
57 my $delta = Date::Handler::Delta->new({
58 years => 1,
59 months => 3,
60 days => 5,
61 minutes= > 0,
62 seconds => 0,
63 });
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65 • As array reference, the order if years, months, days, minutes
66 seconds
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68 • As hash reference, the keys are years, months, days, minutes,
69 seconds.
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71 Accessors
72 You can access the data inside the object using any of the provided
73 methods. These methods are detailed in the SYNOPSIS up above.
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75 Since Date::Handler uses operator overloading, you can 'apply' a Delta
76 object on an absolute date simply by using built-in operators.
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78 Example:
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80 #A Delta of 1 year.
81 my $delta = new Date::Handler::Delta([1,0,0,0,0,0]);
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83 my $date = new Date::Handler({ date => time } );
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85 #$newdate is now one year in the furure.
86 my $newdate = $date+$delta;
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88 Operator overload special cases
89 The Date::Handler overloaded operator have special cases. Refer to the
90 SYNOPSIS to get a description of each overloaded operator's behaviour.
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92 One special case of the overload is when adding an integer 'n' to a
93 Date::Handler's reference. This is treated as if 'n' was in seconds.
94 Same thing for substraction.
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96 Example Uses of the overload:
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98 my $date = new Date::Handler({ date =>
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100 year => 2001,
101 month => 5,
102 day => 14,
103 hour => 5,
104 min => 0,
105 sec => 0,
106 }});
107 #Quoted string overload
108 print "Current date is $date\n";
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110 my $delta = new Date::Handler::Delta({ days => 5, });
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112 #'+' overload, now, $date is 5 days in the future.
113 $date += $delta;
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115 #Small clock. Not too accurate, but still ;)
116 while(1)
117 {
118 #Add one second to the date. (same as $date + 1)
119 $date++;
120 print "$date\n";
121 sleep(1);
122 }
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125 Deltas going after 2038 are not handled by this module yet. (POSIX)
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127 Deltas before 1902 are not handled by this module. (POSIX)
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129 If you find bugs with this module, do not hesitate to contact the
130 author. Your comments and rants are welcomed :)
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133 Refine reduction to simplest expression of the delta.
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136 Copyright(c) 2001 Benoit Beausejour <bbeausej@pobox.com>
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138 All rights reserved. This program is free software; you can
139 redistribute it and/or modify it under the same terms as Perl itself.
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141 Portions Copyright (c) Philippe M. Chiasson <gozer@cpan.org>
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143 Portions Copyright (c) Szabó, Balázs <dlux@kapu.hu>
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145 Portions Copyright (c) Larry Rosler
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148 Benoit Beausejour <bbeausej@pobox.com>
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151 Date::Handler(1). Date::Handler::Range(1). Class::Date(1).
152 Time::Object(1). Date::Calc(1). perl(1).
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155 Hey! The above document had some coding errors, which are explained
156 below:
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158 Around line 459:
159 Non-ASCII character seen before =encoding in 'Szabó,'. Assuming
160 CP1252
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164perl v5.34.0 2021-07-22 Handler::Delta(3)