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16017f6d78
Draft 3 of IEEE 1003.1 200x, "2.2 The Compilation Environment" All identifiers that begin with an underscore and either an uppercase letter or another underscore are always reserved for any use by the implementation.
97 lines
3.8 KiB
C
97 lines
3.8 KiB
C
#ifndef SDNCAL_H
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#define SDNCAL_H
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/*
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* This code has been modified for use with PHP
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* by Shane Caraveo shane@caraveo.com
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* see below for more details
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*
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*/
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/* $selId: sdncal.h,v 2.0 1995/10/24 01:13:06 lees Exp $
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* Copyright 1993-1995, Scott E. Lee, all rights reserved.
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* Permission granted to use, copy, modify, distribute and sell so long as
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* the above copyright and this permission statement are retained in all
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* copies. THERE IS NO WARRANTY - USE AT YOUR OWN RISK.
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*/
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/**************************************************************************
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*
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* This package defines a set of routines that convert calendar dates to
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* and from a serial day number (SDN). The SDN is a serial numbering of
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* days where SDN 1 is November 25, 4714 BC in the Gregorian calendar and
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* SDN 2447893 is January 1, 1990. This system of day numbering is
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* sometimes referred to as Julian days, but to avoid confusion with the
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* Julian calendar, it is referred to as serial day numbers here. The term
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* Julian days is also used to mean the number of days since the beginning
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* of the current year.
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*
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* The SDN can be used as an intermediate step in converting from one
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* calendar system to another (such as Gregorian to Jewish). It can also
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* be used for date computations such as easily comparing two dates,
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* determining the day of the week, finding the date of yesterday or
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* calculating the number of days between two dates.
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*
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* When using this software on 16 bit systems, be careful to store SDNs in
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* a long int, because it will not fit in the 16 bits that some systems
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* allocate to an int.
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*
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* For each calendar, there are two routines provided. One converts dates
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* in that calendar to SDN and the other converts SDN to calendar dates.
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* The routines are named SdnTo<CALENDAR>() and <CALENDAR>ToSdn(), where
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* <CALENDAR> is the name of the calendar system.
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*
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* SDN values less than one are not supported. If a conversion routine
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* returns an SDN of zero, this means that the date given is either invalid
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* or is outside the supported range for that calendar.
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*
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* At least some validity checks are performed on input dates. For
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* example, a negative month number will result in the return of zero for
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* the SDN. A returned SDN greater than one does not necessarily mean that
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* the input date was valid. To determine if the date is valid, convert it
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* to SDN, and if the SDN is greater than zero, convert it back to a date
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* and compare to the original. For example:
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*
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* int y1, m1, d1;
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* int y2, m2, d2;
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* long int sdn;
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* ...
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* sdn = GregorianToSdn(y1, m1, d1);
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* if (sdn > 0) {
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* SdnToGregorian(sdn, &y2, &m2, &d2);
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* if (y1 == y2 && m1 == m2 && d1 == d2) {
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* ... date is valid ...
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* }
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* }
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*
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**************************************************************************/
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/* Gregorian calendar conversions. */
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void SdnToGregorian(long int sdn, int *pYear, int *pMonth, int *pDay);
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long int GregorianToSdn(int year, int month, int day);
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extern char *MonthNameShort[13];
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extern char *MonthNameLong[13];
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/* Julian calendar conversions. */
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void SdnToJulian(long int sdn, int *pYear, int *pMonth, int *pDay);
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long int JulianToSdn(int year, int month, int day);
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/* Jewish calendar conversions. */
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void SdnToJewish(long int sdn, int *pYear, int *pMonth, int *pDay);
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long int JewishToSdn(int year, int month, int day);
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extern char *JewishMonthName[14];
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/* French republic calendar conversions. */
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void SdnToFrench(long int sdn, int *pYear, int *pMonth, int *pDay);
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long int FrenchToSdn(int inputYear, int inputMonth, int inputDay);
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extern char *FrenchMonthName[14];
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/* Islamic calendar conversions. */
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/* Not implemented yet. */
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/* Day of week conversion. 0=Sunday, 6=Saturday */
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int DayOfWeek(long int sdn);
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extern char *DayNameShort[7];
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extern char *DayNameLong[7];
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#endif /* SDNCAL_H */
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