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Date::Manip::Holidays(User Contributed Perl DocumentDate::Manip::Holidays(3pm)

       Date::Manip::Holidays - describes holidays and events

       This describes the Holidays and Events sections of the config file, and
       how they are used.

       Holidays and events are specific days that are named. Holidays are used
       in business mode calculations, events are not. Events may be used for
       other calendaring operations.

       The holiday section of the config file is used to define holidays.
       Each line is of the form:

          STRING = HOLIDAY

       HOLIDAY is the name of the holiday (or it can be blank in which case
       the day will still be treated as a holiday... for example the day after
       Thanksgiving is often a work holiday though it is not named).

       STRING is a string which can be parsed to give a valid date. It can be
       any of the following forms:

       A full date
           Specific holidays can be set which occur only a single time.

              May 5, 2000                     = A one-time-only holiday

           Any format parseable by Date::Manip::Date::parse_date can be used.

       A date without a year
           Some holidays occur every year on the same day. These can be
           defined using the simple lines:

              Jan 1                           = New Year's Day
              Jul 4th                         = Independence Day
              fourth Thu in Nov               = Thanksgiving

           These dates must be written in a form which can be parsed as a full
           date by simply adding the year to the end of the string. Please
           refer to the Date::Manip::Date documentation to see what forms will
           work. ISO 8601 dates will not work since the year comes first.

           Any format parseable by Date::Manip::Date::parse_date can be used.

           The dates can be specified using recurrences:

              1*0:0:0:0:0:0*EASTER            = Easter
              1*11:0:11:0:0:0*DWD             = Veteran's Day
              1*11:4:5:0:0:0                  = Thanksgiving
              1*11:4:5:0:0:0*FD1              = Day after Thanksgiving

           In cases where you are interested in business type calculations,
           you'll want to define most holidays using recurrences, since they
           can define when a holiday is celebrated in the financial world.
           For example, Christmas might be defined as:

              Dec 25               = Christmas

           but if it falls on a weekend, there won't be a business holiday
           associated with it. It could be defined using a recurrence:

              1*12:0:24:0:0:0*DWD  = Christmas

           so that if Christmas falls on a weekend, a holiday will be taken on
           the Friday before or the Monday after the weekend.

           You can use the fully specified format of a recurrence:

             1*2:0:1:0:0:0***Jan 1 1999*Dec 31 2002 = Feb 2 from 1999-2002

       Recurrences which change years
           It is now valid to have a recurrence defined for New Year's day
           which pushes the holiday to the previous year.

           For example, the most useful definition of New Year's day is:

              1*1:0:1:0:0:0*DWD               = New Year's Day

           which means to choose the closest working day to observe the
           holiday, even though this might mean that the holiday is observed
           on the previous year.

       Order of definitions is preserved
           The order of the definitions is preserved. In other words, when
           looking at the holidays for a year, previously defined holidays (in
           the order given in the config file) are correctly handled.

           As an example, if you wanted to define both Christmas and Boxing
           days (Boxing is the day after Christmas, and is celebrated in some
           parts of the world), and you wanted to celebrate Christmas on a
           business day on or after Dec 25, and Boxing day as the following
           work day, you could do it in one of the following ways:

              1*12:0:25:0:0:0*NWD  = Christmas
              1*12:0:26:0:0:0*NWD  = Boxing


              1*12:0:25:0:0:0*NWD  = Christmas
              1*12:0:25:0:0:0*NWD  = Boxing

           Holidays go into affect the minute they are parsed which is why the
           second example works (though for clarity, the first one is
           preferable).  The first recurrence defined the first business day
           on or after Dec 25 as Christmas.  The second one then defines the
           business day after that as Boxing day.  Since the definitions are
           stored as a list (NOT a hash as they were in Date::Manip 5.xx),
           using the same recurrence twice does not cause a problem.

       Multiple holidays
           Having multiple holidays on a single day is allowed. As an example,
           you may want to look at New Years day as both the observed and
           actual holidays, so you might have:

              1*1:0:1:0:0:0*DWD               = New Year's Day (observed)
              Jan 1                           = New Year's Day

           Most of the time, both will fall on the same day, but sometimes
           they may differ.  In this example, it is important that the
           observed holiday be listed first.  Otherwise, Jan 1 will be marked
           as a holiday and then the observed date will check Jan 1, but where
           it is not a business day, it will move to another day (due to the
           DWD modifier).

           Likewise, the two holidays:

              3rd Sunday in June              = Father's Day
              Jun 17                          = Bunker Hill Day

           sometimes fall on the same day.  Using the
           Date::Manip::Date::list_holidays method (or the Date_IsHoliday
           function), you can get a list of all names that the date contains.

       The Events section of the config file is similar to the Holiday
       section.  It is used to name certain days or times, but there are a few
       important differences:

       Events can be assigned to any time and duration
           All holidays are exactly 1 day long.  They are assigned to a period
           of time from midnight to midnight.

           Events can be based at any time of the day, and may be of any

       Events don't affect business mode calculations
           Unlike holidays, events are completely ignored when doing business
           mode calculations.

       Whereas holidays were added with business mode math in mind, events
       were added with calendar and scheduling applications in mind.

       Every line in the events section is of the form:

          EVENT = NAME

       where NAME is the name of the event, and EVENT defines when it occurs
       and its duration.  An EVENT can be defined in the following ways:


          Date  ; Date
          YMD   ; YMD
          YM    ; YM
          Date  ; Delta
          Recur ; Delta

       Date refers to a full date/time (and is any string that can be parsed
       by Date::Manip::Date::parse). YMD is any string which can be parsed by
       Date::Manip::Date::parse_date. YM is any string which can be parsed by
       the parse_date method to give a date in the current year. Recur is a
       partial or fully specified recurrence. Delta is any string that can be
       parsed to form a delta.

       With the "Date" form, or the "Recur" form, the event starts at the time
       (or times) specified by the date or recurrence, and last 1 hour long.
       With the "YMD" and "YM" forms, the event occurs on the given day, and
       lasts all day.

       With all of the two part forms ("Date;Date", "YM;YM", etc.), the event
       starts at the first date and goes to the second date, or goes an amount
       of time specified by the delta.

       The "YMD;YMD" and "YM;YM" forms means that the event lasts from the
       start of the first date to the end of the second. In the Date;Date
       form, the event goes from the first date to the second date inclusive.
       In other words, both dates are in the event. In the "Date;Delta" and
       "Recur;Delta" forms, the Delta tells the length of the event. Also, in
       the Date;Date form, the second date may NOT be expressed as a delta.

       Currently, having an event longer than 1 year is NOT supported, but no
       checking is done for this.

       None known.

       Please refer to the Date::Manip::Problems documentation for information
       on submitting bug reports or questions to the author.

       Date::Manip        - main module documentation

       This script is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

       Sullivan Beck (

perl v5.20.0                      2014-09-14        Date::Manip::Holidays(3pm)

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