datetime.h

/*
 * datetime.h
 * This file is part of DCL
 *
 * Copyright (c) 2009 Dennis Prochko <wolfsoft@mail.ru>
 *
 * DCL 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 version 3.
 *
 * DCL 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 DCL; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 */

#ifndef _DATETIME_H_
#define _DATETIME_H_

#include <ctime>
#include <string>

namespace dbp {

#define DEFAULT_DATETIME_FORMAT "%a, %d %b %Y %H:%M:%S %Z"


class datetime {
public:
        datetime(): _t(0) { };
        datetime(const std::string &src, const std::string &fmt =
          DEFAULT_DATETIME_FORMAT);
        datetime(const datetime &rhs) {
                _t = rhs._t;
        }
        datetime& operator=(const datetime &rhs) {
                _t = rhs._t;
                return *this;
        }
        bool operator==(const datetime &rhs) const {
                return (_t == rhs._t);
        }
        bool operator<(const datetime &rhs) const {
                return _t < rhs._t;
        }
        bool operator>(const datetime &rhs) const {
                return (rhs < *this);
        }
        bool operator<=(const datetime &rhs) const {
                return !(rhs < *this);
        }
        bool operator>=(const datetime& rhs) const {
                return !(*this < rhs);
        }
        bool operator!=(const datetime &rhs) const {
                return !(*this == rhs);
        }
        bool operator!() const {
                return empty();
        }
        int operator-(const datetime& rhs);
        typedef bool (datetime::*bool_type)() const;
        operator bool_type() const {
                return empty() ? NULL : &datetime::empty;
        }
        datetime& now();
        int year() const;
        datetime& year(int val);
        int month() const;
        datetime& month(int val);
        int day() const;
        datetime& day(int val);
        int hour() const;
        datetime& hour(int val);
        int minute() const;
        datetime& minute(int val);
        int second() const;
        datetime& second(int val);
        void clear();
        bool empty() const;

        std::string str(const std::string &format = DEFAULT_DATETIME_FORMAT) const;
        std::string as_gmt() const;
private:
        time_t _t;
};

}

#endif /*_DATETIME_H_*/