75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/* persian calendar functions original code is by Kees Couprie
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http://www.geocities.com/couprie/calmath/ */
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/* islamic conversion and moonphase calculation is taken from
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*
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* hdate
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*
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* Copyright (c) 1992 by Waleed A. Muhanna
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*
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* Permission for nonprofit use and redistribution of this software and
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* its documentation is hereby granted without fee, provided that the
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* above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation.
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*
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* No representation is made about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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* Send any comments/suggestions/fixes/additions to:
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* wmuhanna@magnus.acs.ohio-state.edu
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*
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <ical.h>
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#define TIMZ 3.0
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#define MINAGE 13.5
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#define SUNSET 19.5 /*approximate */
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#define TIMDIF (SUNSET-MINAGE)
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#define NMONTHS (1405*12+1)
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#define RPD (0.01745329251994329577) /* radians per degree (pi/180) */
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/*general*/
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int days_in_month(int month, int year, int calendar);
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int day_of_week(struct icaltimetype dt);
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/* related to gregorian calendar*/
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struct icaltimetype get_civil(struct icaltimetype dt, int calendar);
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long civil_jdn(struct icaltimetype dt);
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struct icaltimetype jdn_civil(long jdn);
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int isGregorianLeap(int year);
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int days_in_gregorian_month(int month, int year);
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/*related to persian calendar*/
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long persian_jdn(struct icaltimetype dt);
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struct icaltimetype jdn_persian(long jdn);
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struct icaltimetype civil_persian(struct icaltimetype dt);
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struct icaltimetype persian_civil(struct icaltimetype dt);
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int isPersianLeap(int year);
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int days_in_persian_month(int month, int year);
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/*related to islamic calendar*/
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long islamic_jdn(struct icaltimetype dt);
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struct icaltimetype jdn_islamic(long jdn);
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struct icaltimetype civil_islamic(struct icaltimetype dt);
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struct icaltimetype islamic_civil(struct icaltimetype dt);
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int days_in_islamic_month(int month, int year);
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/*moonphase*/
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int moon(struct icaltimetype dt);
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/*day comparing functions*/
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int daysComp(struct icaltimetype d1, struct icaltimetype d2);
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int daysEqual(struct icaltimetype d1, struct icaltimetype d2);
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int daysLater(struct icaltimetype d1, struct icaltimetype d2);
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int daysEarlier(struct icaltimetype d1, struct icaltimetype d2);
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int daysLaterEqual(struct icaltimetype d1, struct icaltimetype d2);
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int daysEarlierEqual(struct icaltimetype d1, struct icaltimetype d2);
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int Ceil(float number);
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int datemoon[200][2]; /* hashtable for moonphase.[jdn%32][0] stores moonphase of day jdn,
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[jdn%32][1] stores jdn. */
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