gdatetime.h

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//
// Copyright (C) 2001-2013 Graeme Walker <graeme_walker@users.sourceforge.net>
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
// ===

#ifndef G_DATE_TIME_H
#define G_DATE_TIME_H

#include "gdef.h"
#include "gexception.h"
#include <ctime>
#include <string>

namespace G
{
        class DateTime ;
}

class G::DateTime 
{
public:
        G_EXCEPTION( Error , "date/time error" ) ;
        typedef std::time_t EpochTime ;
        typedef struct std::tm BrokenDownTime ;
        typedef std::pair<bool,unsigned int> Offset ;

        static EpochTime now() ;

        static EpochTime epochTime( const BrokenDownTime & broken_down_time ) ;

        static BrokenDownTime utc( EpochTime epoch_time ) ;

        static BrokenDownTime local( EpochTime epoch_time ) ;

        static Offset offset( EpochTime epoch_time ) ;

        static std::string offsetString( Offset offset ) ;

private:
        static bool equivalent( EpochTime , const BrokenDownTime & ) ;
        static bool same( const BrokenDownTime & , const BrokenDownTime & ) ;
        static std::tm * gmtime_r( const std::time_t * , std::tm * ) ;
        static std::tm * localtime_r( const std::time_t * , std::tm * ) ;
        DateTime() ; // not implemented
} ;

#endif