NAME

       Oxford::Calendar - University of Oxford calendar conversion routines

SYNOPSIS

           use 5.10.0;
           use Oxford::Calendar;
           use Date::Calc;
           say "Today is " . Oxford::Calendar::ToOx(reverse Date::Calc::Today);

DESCRIPTION

       This module converts University of Oxford dates (Oxford academic dates) to and from Real
       World dates, and provides information on Terms of the University.

       The Terms of the University are defined by the Regulations on the number and lengths of
       terms, available online from

       <https://www.admin.ox.ac.uk/examregs/2015-16/rotnalengofterm/>

       This document describes the start and end dates of Oxford Terms.

       In addition to this, the dates of Full Term, required to calculate the week number of the
       term, are prescribed by Council, and published periodically in the University Gazette.

       Full term comprises weeks 1-8 inclusive, but sometimes, dates outside of full term are
       presented in the Oxford academic date format.  This module will optionally provide such
       dates.

       Data for these prescribed dates may be supplied in the file /etc/oxford-calendar.yaml; if
       this file does not exist, built-in data will be used. The built-in data is periodically
       updated from the semi-authoritative source at

       <http://www.ox.ac.uk/about/facts-and-figures/dates-of-term>.

       or the authoritative source, the Gazette, available online from

       <http://www.ox.ac.uk/gazette/>.

       <http://www.ox.ac.uk/news-and-events/The-University-Year> describes the academic year at
       Oxford.

DATE FORMAT

       An Oxford academic date has the following format:

           <day of week>, <week number>[st,nd,rd,th] week, <term name> <year>

       where term name is one of

       •   Michaelmas (autumn)

       •   Hilary (spring)

       •   Trinity (summer)

       Example:

       Friday, 8th Week, Michaelmas 2007

FUNCTIONS

       ToOx($day, $month, $year, [\%options])
          Given a day, month and year in standard human format (that is, month is 1-12, not 0-11,
          and year is four digits) will return a string of the form

              Day, xth week, Term year

          or an array

              (Day, week of term, Term, year)

          depending on how it is called. The exact behaviour is modified by the 'mode' option
          described below.

          If the requested date is not in full term or extended term (see below), undef will be
          returned.

          If the requested date is not covered by the database, ToOx will die with an "out of
          range" error message. Therefore it is recommended to eval ToOx with appropriate error
          handling.

          %options can contain additional named parameter options:

          mode Several modes are available:

               full_term
                     Term dates will only be returned if the date requested is part of a full
                     term (as defined by the web page above).

               ext_term
                     Term dates will only be returned if the date requested is part of an
                     extended term, or statutory term.

               nearest
                     Will return term dates based on the nearest term, even if the date requested
                     is not part of an extended term (i.e. will include fictional week numbers).

                     This is currently the default behaviour, for backwards compatibility with
                     previous releases; this may be changed in future.

          confirmed
              If true, ignores dates marked as provisional in the database.

       ThisTerm($year, $month, $day)
          Given a year, month, term in standard human format (that is, month is 1-12, not 0-11,
          and year is four digits) will returns the current term or undef if in vacation or
          unknown. The term is given as an array in the form (year, term).

       NextTerm($year, $month, $day)
          Given a day, month and year in standard human format (that is, month is 1-12, not 0-11,
          and year is four digits) will return the next term (whether or not the date given is in
          term time).  The term is given as an array in the form (year, term).

       StatutoryTermDates($year)
          Returns a hash reference keyed on terms for a given year, the value of each being a
          hash reference containing start and end dates for that term.  The dates are stored as
          array references containing numeric year, month, day values.

          Note: these are the statutory term dates, not full term dates.

       Parse($string)
          Takes a free-form description of an Oxford calendar date, and attempts to divine the
          expected meaning. If the name of a term is not found, the current term will be assumed.
          If the description is unparsable, undef is returned.  Otherwise, an array will be
          returned of the form "($year,$term,$week,$day)".

          This function is experimental.

       FromOx($year, $term, $week, $day)
          Converts an Oxford date into a Gregorian date, returning a string of the form
          "DD/MM/YYYY" or undef.

          The arguments are of the same format as returned by ToOx in array context; that is, a
          four-digit year, the name of the term, the week number, and the name of the day of week
          (e.g. 'Sunday').

          If the requested date is not covered by the database, FromOx will die with an "out of
          range" error message. Therefore it is recommended to eval ToOx with appropriate error
          handling.

BUGS

       Bugs may be browsed and submitted at

       <http://rt.cpan.org/Public/Dist/Display.html?Name=Oxford-Calendar>

       A copy of the maintainer's git repository may be found at

       <https://github.com/jmdh/Oxford-Calendar>

AUTHOR

       Simon Cozens is the original author of this module.

       Eugene van der Pijll, "pijll@cpan.org" took over maintenance from Simon for a time.

       Dominic Hargreaves maintains this module (between 2008 and 2015 for IT Services,
       University of Oxford).