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/*
* This work is based on work from Hiram Clawson and has been modified to the
* needs of the libical project. The original copyright notice is as follows:
*/
/*
* Copyright (c) 1986-2000, Hiram Clawson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 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.
*
* Neither name of The Museum of Hiram nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
/*
* The modifications made are licensed as follows (to distinguish between
* the original code and the modifications made, refer to the source code
* history):
*/
/*======================================================================
SPDX-FileCopyrightText: 2018, Markus Minichmayr
https://tapkey.com
SPDX-License-Identifier: LGPL-2.1-only OR MPL-2.0
========================================================================*/
/**
* @file astime.h
* @brief contains definitions of structures used for time calculations.
*/
#ifndef ICAL_ASTIME_H
#define ICAL_ASTIME_H
#include "libical_deprecated.h"
#include "libical_ical_export.h"
typedef struct ut_instant
{
double j_date; /**< Julian decimal date, 0 = 01 Jan 4713 BC 12 HR UT */
long year; /**< year, valid range [-4,713, +2,147,483,647] */
int month; /**< [1-12] */
int day; /**< [1-31] */
int i_hour; /**< [0-23] */
int i_minute; /**< [0-59] */
int i_second; /**< [0-59] */
double d_hour; /**< [0.0-23.9999] includes minute and second */
double d_minute; /**< [0.0-59.9999] includes second */
double d_second; /**< [0.0-59.9999] */
int weekday; /**< [0-6] */
int day_of_year; /**< [1-366] */
} UTinstant, *UTinstantPtr;
/* Functions in caldate.c */
/** Converts julian date to year,mo,da
* @deprecated use caldat_int() instead
*/
LIBICAL_ICAL_EXPORT LIBICAL_DEPRECATED(long caldat(UTinstantPtr));
/** Returns julian day from year,mo,da
* @deprecated use juldat_int() instead
*/
LIBICAL_ICAL_EXPORT LIBICAL_DEPRECATED(double juldat(UTinstantPtr));
typedef struct ut_instant_int
{
long j_date0; /**< julian decimal date, 0 = 01 Jan 4713 BC */
long year; /**< year, valid range [-4,713, +32,767] */
int month; /**< [1-12] */
int day; /**< [1-31] */
int weekday; /**< [0-6] */
int day_of_year; /**< [1-366] */
} UTinstantInt, *UTinstantIntPtr;
/* Functions in caldate.c */
/**
* caldat computes the day of the week, the day of the year
* the gregorian (or julian) calendar date
* from the julian decimal date.
* for astronomical purposes, The Gregorian calendar reform occurred
* on 15 Oct. 1582. This is 05 Oct 1582 by the julian calendar.
* Input: a ut_instant structure pointer, where the j_date element
* has been set. ( = 0 for 01 Jan 4713 B.C.)
*
* output: will set all the other elements of the structure.
* As a convenience, the function will also return the year.
*
* Reference: Astronomial formulae for calculators, meeus, p 23
* from fortran program by F. Espenak - April 1982 Page 277,
* 50 Year canon of solar eclipses: 1986-2035
*
*/
void caldat_int(UTinstantIntPtr);
/**
* juldat computes the julian decimal date (j_date) from
* the gregorian (or Julian) calendar date.
* for astronomical purposes, The Gregorian calendar reform occurred
* on 15 Oct. 1582. This is 05 Oct 1582 by the julian calendar.
* Input: a ut_instant structure pointer where Day, Month, Year
* have been set for the date in question.
*
* Output: the j_date and weekday elements of the structure will be set.
* Also, the return value of the function will be the j_date too.
*
* Reference: Astronomial formulae for calculators, meeus, p 23
* from fortran program by F. Espenak - April 1982 Page 276,
* 50 Year canon of solar eclipses: 1986-2035
*/
void juldat_int(UTinstantIntPtr);
#endif
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