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SCALDATE.H
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C/C++ Source or Header
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1997-07-05
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84 lines
/* +++Date last modified: 05-Jul-1997 */
/*
** scalar date routines -- public domain by Ray Gardner
** Numerically, these will work over the range 1/01/01 thru 14699/12/31.
** Practically, these only work from the beginning of the Gregorian
** calendar thru 14699/12/31. The Gregorian calendar took effect in
** much of Europe in about 1582, some parts of Germany in about 1700, in
** England and the colonies in about 1752ff, and in Russia in 1918.
*/
#ifndef SCALDATE__H
#define SCALDATE__H
#include "sniptype.h"
/*
** Define ISO_CAL to be 1 for ISO (Mon-Sun) calendars
**
** ISO defines the first week with 4 or more days in it to be week #1.
*/
#ifndef ISO_CAL
#define ISO_CAL 0
#endif
#if (ISO_CAL != 0 && ISO_CAL != 1)
#error ISO_CAL must be set to either 0 or 1
#endif
#if ISO_CAL
enum DOW_T {DOW_IGNORE = -1,
MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY};
#else
enum DOW_T {DOW_IGNORE = -1,
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY};
#endif
/*
** Daylight savings time rules.
**
** Rules include a month, date, and day. If the day is DOW_IGNORE, DST will
** start on the month and date specified. If a day is specified (the
** interpretation of the day parameter is subject to the value of ISO_CAL),
** DST will start on the first such day following (or equal to) the specified
** date, or stop on the first such day preceding (or equal to) the specified
** date.
**
** The defaults defined for the U.S. mean that DST will begin on the first
** Sunday after (or on) April 1 and end on the last Sunday preceding (or on)
** October 31.
*/
extern unsigned DST_start_mo;
extern unsigned DST_start_dt;
extern enum DOW_T DST_start_dy;
extern unsigned DST_stop_mo;
extern unsigned DST_stop_dt;
extern enum DOW_T DST_stop_dy;
int isleap (unsigned yr);
long ymd_to_scalar (unsigned yr, unsigned mo, unsigned day);
void scalar_to_ymd (long scalar, unsigned *yr, unsigned *mo, unsigned *day);
int daynum(int year, int month, int day);
int weeknum(int year, int month, int day);
Boolean_T valiDate(unsigned yr, unsigned mo, unsigned day);
unsigned dow(unsigned yr, unsigned mo, unsigned day);
unsigned DOW(unsigned y, unsigned m, unsigned d);
long today(void);
extern char *MoonPhaseText[8];
unsigned moonphase(unsigned yr, unsigned mo, unsigned dy);
int getfdate (int handle, long *date);
int getdatef (char *fname, long *date);
#endif /* SCALDATE__H */