SYNOPSIS

     use App::datecalc;
     my $calc = App::datecalc->new;
     say $calc->eval('2014-05-13 + 2 days'); # -> 2014-05-15

DESCRIPTION

    This is an early release. More features and documentation will follow
    in subsequent releases.

    This module provides a date calculator, for doing date-related
    calculations. You can write date literals in ISO 8601 format (though
    not all format variants are supported), e.g. 2014-05-13. Date duration
    can be specified using the natural syntax e.g. 2 days 13 hours or using
    the ISO 8601 format e.g. P2DT13H.

    Currently supported calculations:

      * date literals

       2014-05-19
       now
       today
       tomorrow

      * (NOT YET) time and date-time literals

      * duration literals, either in ISO 8601 format or natural syntax

       P3M2D
       3 months 2 days

      * date addition/subtraction with a duration

       2014-05-19 - 2 days
       2014-05-19 + P29W

      * date subtraction with another date

       2014-05-19 - 2013-12-25

      * duration addition/subtraction with another duration

       1 week 1 day + P10D

      * duration multiplication/division with a number

       P2D * 2
       2 * P2D

      * extract elements from date

       year(2014-05-20)
       quarter(today)
       month(today)
       day(today)
       dow(today)
       doy(today)
       doq(today)
       wom(today)
       woy(today)
       hour(today)
       minute(today)
       second(today)

      * extract elements from duration

       years(P22D)
       months(P22D)
       weeks(P22D)
       days(P22D)       # 1, because P22D normalizes to P3W1D
       totdays(P22D)    # 22
       days(P1M1D)      # 1
       totdays(P1M1D)   # 1, because months cannot be converted to days
       hours(P22D)
       minutes(P22D)
       seconds(P22D)

      * some simple number arithmetics

       3+4.5
       2**3 * P1D
       abs(2-5)         # 3
       round(1.6+3)     # 5

      * (NOT YET) date comparison

       today >= 2014-05-20

      * (NOT YET) duration comparison

       P20D < P3W

METHODS

 new

 eval

SEE ALSO

    DateTime and DateTime::Format::ISO8601, the backend modules used to do
    the actual date calculation.

    Marpa::R2 is used to generate the parser.

    Date::Calc another date module on CPAN. No relation except the
    similarity of name.

    http://en.wikipedia.org/wiki/ISO_8601 for more information about the
    ISO 8601 format.