Image

head

code

item

root

para

L<Examples| file:../examples/index.podlite>


L<Download |file:../download/index.podlite>


React

=begin React :component<HeaderCol> :id<menu> 
=para L<Documentation|/doc/introduction>
=para L<Modules| /mods>
=para L<Examples| file:../examples/index.podlite>
=para L<Download |file:../download/index.podlite>
=para L<About|file:../about/index.podlite>
=para 🔍 K<⌘K>/K<ctrl-K>
=end React


HEADER

FOOTER

README

CODE_OF_CONDUCT

unit module DateTime::Math:ver<0.6.1>:auth<zef:raku-community-modules>;

my subset DurationUnits of Str where -> $unit { $unit ~~ /^<[smhdwMy]>$/ }

## to-seconds: takes a value and a unit string, and converts the value
#    into seconds.
#
#    The value must be a number, the unit string must be one of:
#
#     's'  Seconds, this is redundant it returns the string without the 's'.
#     'm'  Minutes, so 1m will return 60.
#     'h'  Hour,    so 1h will return 3600.
#     'd'  Day,     so 1d will return 86400.
#     'w'  Week,    so 1w will return 604800.
#     'M'  Month,   so 1M will return 2592000. This is based on 30 days.
#     'y'  Year,    so 1y will return 31449600. Uses a round 365 days.
#
#    The Month estimation is not very accurate as it assumes 30 days regardless
#    of month, if you need more accuracy, use a day count instead.
#
# The Year estimation is based on a round 365 days, and does not take into
# account leap years or anything else. Again, if you need more accuracy,
# use a smaller unit.
#
#
sub to-seconds ( Numeric $value, DurationUnits $in ) is export {
    do given $in {
        when 's' { $value }
        my $minute := $value * 60;
        when 'm' { $minute }
        my $hour := $minute * 60;
        when 'h' { $hour }
        my $day := $hour * 24;
        when 'd' { $day }
        when 'w' { $day * 7   }
        when 'M' { $day * 30  }
        when 'y' { $day * 365 }
    }
}

## from-seconds: takes a value in seconds and converts it into the
#    specified unit.
#
# The value and unit must be specified using the same rules as to-seconds().
#
sub from-seconds ( Numeric $value, DurationUnits $to ) is export {
    do given $to {
        when 's' { $value }
        my $minute := $value / 60;
        when 'm' { $minute }
        my $hour := $minute / 60;
        when 'h' { $hour }
        my $day := $hour / 24;
        when 'd' { $day }
        when 'w' { $day / 7   }
        when 'M' { $day / 30  }
        when 'y' { $day / 365 }
    }
}

## duration-from-to: takes a value, the unit string the value is currently in,
## and the unit string you want to covert the value to.
sub duration-from-to(
  Numeric:D $value, DurationUnits:D $in, DurationUnits:D $to
) is export {
    from-seconds to-seconds($value, $in), $to;
}

multi infix:<+>(DateTime:D $dt, Numeric:D $x) is export {
    $dt.WHAT.new($dt.Numeric + $x,
      :timezone($dt.timezone), :formatter($dt.formatter))
}

multi infix:<+>(Numeric:D $x, DateTime:D $dt) is export {
    $dt + $x
}

multi infix:«-»(DateTime:D $dt, Numeric:D $x) is export {
    $dt.WHAT.new($dt.Numeric - $x,
      :timezone($dt.timezone), :formatter($dt.formatter))
}



Datetime::Math - Add common math operations to DateTime objects


=begin code :lang<raku>

use Datetime::Math;

# Given $dt1 and $dt2 are both DateTime objects.
my $days = from-seconds($dt2 - $dt1, 'd');
say "The events where $days days apart";

my $target = $dt1 + to-seconds(1, 'M');
say "One month after $dt1 would be $target";

my $hours = duration-from-to(3, 'y', 'h');
say "3 years contains $hours hours.";

=end code


Provides C<to-seconds()>, C<from-seconds()>, C<duration-from-to()> and the ability
to perform certain math operations on DateTime objects.


This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.


Math

The Raku Knowledge Base


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=item1 B<Language>
    =item2 L<Get started|file:../getting-started/getting-started.podlite>
    =item2 L<Why Raku?|/doc/language/faq#Why-should-I-learn-Raku-What's-so-great-about-it>
    =item2 L<Try Raku|https://glot.io/new/raku>
    =item2 L<Raku cheat sheet|https://github.com/Raku/mu/blob/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<Raku on Exercism|https://exercism.org/tracks/raku>
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    =item2 L<Type Reference| file:../doc/types.podlite>
    =item2 L<Miscellaneous| file:../doc/miscellaneous.podlite>
    =item2 L<FAQs (Frequently Asked Questions)|/doc/language/faq>
    =item2 L<Community|/doc/language/community>
    =item2 L<The list of all documents|file:../doc/index.podlite>

=item1 B<Resources>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>

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    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Wikibook |https://en.wikibooks.org/wiki/Raku_Programming>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>
    =item2 L<Learn Raku in Y minutes|https://learnxinyminutes.com/docs/raku/>
    =item2 L<Golfing |https://github.com/AlexDaniel/raku-golf-cheatsheet>
=end nested
=begin nested :!nested

=item1 B<Explore>
    =item2 L<Raku Blog Aggregator|https://planet.raku.org/>
    =item2 L<Rakudo Weekly|https://rakudoweekly.blog/>
    =item2 L<The Weekly Challenge |https://perlweeklychallenge.org/>
    =item2 L<Raku Advent Calendar|https://raku-advent.blog/>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=end React


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README

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Datetime::Math v0.6.1

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