greg_date.hpp

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#ifndef GREG_DATE_HPP___
#define GREG_DATE_HPP___

/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
 * Use, modification and distribution is subject to the 
 * Boost Software License, Version 1.0. (See accompanying
 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
 * Author: Jeff Garland 
 * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $
 */

#include "boost/date_time/date.hpp"
#include "boost/date_time/special_defs.hpp"
#include "boost/date_time/gregorian/greg_calendar.hpp"
#include "boost/date_time/gregorian/greg_duration.hpp"

namespace boost {
namespace gregorian {

  //bring special enum values into the namespace
  using date_time::special_values;
  using date_time::not_special;
  using date_time::neg_infin;
  using date_time::pos_infin;
  using date_time::not_a_date_time;
  using date_time::max_date_time;
  using date_time::min_date_time;

  //! A date type based on gregorian_calendar
  /*! This class is the primary interface for programming with 
      greogorian dates.  The is a lightweight type that can be
      freely passed by value.  All comparison operators are 
      supported.  
      \ingroup date_basics
  */
  class date : public date_time::date<date, gregorian_calendar, date_duration>
  {
   public:
    typedef gregorian_calendar::year_type year_type;
    typedef gregorian_calendar::month_type month_type;
    typedef gregorian_calendar::day_type day_type;
    typedef gregorian_calendar::day_of_year_type day_of_year_type;
    typedef gregorian_calendar::ymd_type ymd_type;
    typedef gregorian_calendar::date_rep_type date_rep_type;
    typedef gregorian_calendar::date_int_type date_int_type;
    typedef date_duration  duration_type;
#if !defined(DATE_TIME_NO_DEFAULT_CONSTRUCTOR)
    //! Default constructor constructs with not_a_date_time
    date():
      date_time::date<date, gregorian_calendar, date_duration>(date_rep_type::from_special(not_a_date_time))
    {}
#endif // DATE_TIME_NO_DEFAULT_CONSTRUCTOR
    //! Main constructor with year, month, day
    date(year_type y, month_type m, day_type d) 
      : date_time::date<date, gregorian_calendar, date_duration>(y, m, d)
    {
      if (gregorian_calendar::end_of_month_day(y, m) < d) {
        throw bad_day_of_month(std::string("Day of month is not valid for year"));
      }
    }
    //! Constructor from a ymd_type structure
    explicit date(const ymd_type& ymd) 
      : date_time::date<date, gregorian_calendar, date_duration>(ymd)
    {}
    //! Needed copy constructor
    explicit date(const date_int_type& rhs):
      date_time::date<date,gregorian_calendar, date_duration>(rhs)
    {}
    //! Needed copy constructor
    explicit date(date_rep_type rhs):
      date_time::date<date,gregorian_calendar, date_duration>(rhs)
    {}
    //! Constructor for infinities, not a date, max and min date
    explicit date(special_values sv):
      date_time::date<date, gregorian_calendar, date_duration>(date_rep_type::from_special(sv))
    {
      if (sv == min_date_time)
      {
        *this = date(1400, 1, 1);
      }
      if (sv == max_date_time)
      {
        *this = date(9999, 12, 31);
      }

    }
    //!Return the Julian Day number for the date.
    date_int_type julian_day() const
    {
      ymd_type ymd = year_month_day();
      return gregorian_calendar::julian_day_number(ymd);
    }
    //!Return the day of year 1..365 or 1..366 (for leap year)
    day_of_year_type day_of_year() const
    {
      date start_of_year(year(), 1, 1);
      unsigned short doy = static_cast<unsigned short>((*this-start_of_year).days() + 1);
      return day_of_year_type(doy);
    }
    //!Return the Modified Julian Day number for the date.
    long modjulian_day() const
    {
      ymd_type ymd = year_month_day();
      return gregorian_calendar::modjulian_day_number(ymd);      
    }
    //!Return the iso 8601 week number 1..53
    int week_number() const
    {
      ymd_type ymd = year_month_day();
      return gregorian_calendar::week_number(ymd);      
    }
    //! Return the day number from the calendar
    date_int_type day_number() const
    {
      return days_;
    }
    //! Return the last day of the current month
    date end_of_month() const
    {
      ymd_type ymd = year_month_day(); 
      short eom_day =  gregorian_calendar::end_of_month_day(ymd.year, ymd.month);
      return date(ymd.year, ymd.month, eom_day);
    }

   private:

  };
  


} } //namespace gregorian



#endif