PDateTime.h

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// -*- C++ -*-

// PDateTime
// Copyright (c) 2002 by Nicolas Chapados

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
// 
//  2. Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
// 
//  3. The name of the authors may not be used to endorse or promote
//     products derived from this software without specific prior written
//     permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
// NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// This file is part of the PLearn library. For more information on the PLearn
// library, go to the PLearn Web site at www.plearn.org

/* *******************************************************      
   * $Id: PDateTime.h,v 1.4 2004/02/28 17:53:51 tihocan Exp $
   * This file is part of the PLearn library.
   ******************************************************* */


#ifndef PDateTime_INC
#define PDateTime_INC

//#include <iostream>
#include <string>

namespace PLearn {
using namespace std;

class PDateTime
{
public:
  short year; 
  unsigned char month; 
  unsigned char day; 
  unsigned char hour; 
  unsigned char min;  
  unsigned char sec;  

  PDateTime();

  PDateTime(short the_year, unsigned char the_month, unsigned char the_day)
    : year(the_year), month(the_month), day(the_day),
      hour(0), min(0), sec(0) {}

  PDateTime(int the_year, int the_month, int the_day)
    : year(the_year), month(int(the_month)), day(int(the_day)),
      hour(0), min(0), sec(0) {}

  PDateTime(short the_year, unsigned char the_month, unsigned char the_day,
            unsigned char the_hour, unsigned char the_min,
            unsigned char the_sec)
    : year(the_year), month(the_month), day(the_day),
      hour(the_hour), min(the_min), sec(the_sec) {}
  
  PDateTime(int the_year, int the_month, int the_day,
            int the_hour, int the_min, int the_sec)
    : year(the_year), month(the_month), day(the_day),
      hour(the_hour), min(the_min), sec(the_sec) {}
  
  PDateTime(double julian_day);

  PDateTime(string datetime);
  
  bool isMissing() const;
  void setMissing();

  string info() const; 

  bool operator==(const PDateTime& rhs) const {
    return year == rhs.year && month == rhs.month && day == rhs.day
      && hour == rhs.hour && min == rhs.min && sec == rhs.sec;
  }
  
  bool operator!=(const PDateTime& rhs) const {
    return ! (*this == rhs);
  }
  
  bool operator<(const PDateTime& rhs) const {
    double datetime_to_double(const PDateTime& t); // declare the function
    return datetime_to_double(*this) < datetime_to_double(rhs);
  }
  
  bool operator<=(const PDateTime& rhs) const {
    return *this == rhs || *this < rhs;
  }
  
  bool operator>(const PDateTime& rhs) const {
    return ! (*this <= rhs);
  }
  
  bool operator>=(const PDateTime& rhs) const {
    return ! (*this < rhs);
  }

  double toJulianDay() const;
};

inline double operator-(const PDateTime& to_date, const PDateTime& from_date)
{
  return to_date.toJulianDay() - from_date.toJulianDay();
}

inline ostream& operator<<(ostream& os, const PDateTime& date)
{
  os << date.info();
  return os;
}
  
double datetime_to_double(const PDateTime& t);
PDateTime double_to_datetime(double f);

double hhmmss_to_double(int hh, int mm, int ss);

void double_to_hhmmss(double fraction, int& hh, int& mm, int& ss);

} // end of namespace PLearn

#endif

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