gregorian.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code 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.
 *
 * Antkeeper source code 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 Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_PHYSICS_TIME_GREGORIAN_HPP
#define ANTKEEPER_PHYSICS_TIME_GREGORIAN_HPP
 
#include <engine/physics/time/jd.hpp>
 
namespace physics {
namespace time {
 
namespace gregorian {
 
template <class T>
T to_jd(int year, int month, int day, int hour, int minute, T second, T utc)
{
    T jdn = static_cast<T>((1461 * (year + 4800 + (month - 14) / 12)) / 4 + (367 * (month - 2 - 12 * ((month - 14) / 12))) / 12 - (3 * ((year + 4900 + (month - 14) / 12) / 100)) / 4 + day - 32075);
    return jdn + static_cast<T>(hour - 12) / T(24) + static_cast<T>(minute) / T(1440) + static_cast<T>(second) / T(86400) - utc / T(24);
}
 
template <class T>
T to_ut1(int year, int month, int day, int hour, int minute, T second, T utc)
{
    return physics::time::jd::to_ut1<T>(to_jd<T>(year, month, day, hour, minute, second, utc));
}
 
} // namespace gregorian
 
} // namespace time
} // namespace physics
 
#endif // ANTKEEPER_PHYSICS_TIME_GREGORIAN_HPP