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/* ----------------------------------------------------------------<Prolog>-
Name: sfldate.h
Title: Date and time functions
Package: Standard Function Library (SFL)
Written: 1996/01/05 iMatix SFL project team <sfl@imatix.com>
Revised: 1998/08/05
Synopsis: Includes functions to get the current date/time, calculate
the day or week, week of year and leap year. Dates and times
are each stored in a 32-bit long value of 8 digits: dates are
CCYYMMDD; times are HHMMSSCC. You can compare dates and times
directly - e.g. if (date_wanted >= date_now).
Copyright: Copyright (c) 1996-2000 iMatix Corporation
License: This is free software; you can redistribute it and/or modify
it under the terms of the SFL License Agreement as provided
in the file LICENSE.TXT. This software is distributed in
the hope that it will be useful, but without any warranty.
------------------------------------------------------------------</Prolog>-*/
#ifndef SFLDATE_INCLUDED /* Allow multiple inclusions */
#define SFLDATE_INCLUDED
/* Macros */
#define GET_CENTURY(d) (int) ( (d) / 1000000L)
#define GET_CCYEAR(d) (int) ( (d) / 10000L)
#define GET_YEAR(d) (int) (((d) % 1000000L) / 10000L)
#define GET_MONTH(d) (int) (((d) % 10000L) / 100)
#define GET_DAY(d) (int) ( (d) % 100)
#define GET_HOUR(t) (int) ( (t) / 1000000L)
#define GET_MINUTE(t) (int) (((t) % 1000000L) / 10000L)
#define GET_SECOND(t) (int) (((t) % 10000L) / 100)
#define GET_CENTI(t) (int) ( (t) % 100)
#define MAKE_DATE(c,y,m,d) (long) (c) * 1000000L + \
(long) (y) * 10000L + \
(long) (m) * 100 + (d)
#define MAKE_TIME(h,m,s,c) (long) (h) * 1000000L + \
(long) (m) * 10000L + \
(long) (s) * 100 + (c)
#define timeeq(d1,t1,d2,t2) ((d1) == (d2) && (t1) == (t2))
#define timeneq(d1,t1,d2,t2) ((d1) != (d2) || (t1) != (t2))
#define timelt(d1,t1,d2,t2) ((d1) < (d2) || ((d1) == (d2) && (t1) < (t2)))
#define timele(d1,t1,d2,t2) ((d1) < (d2) || ((d1) == (d2) && (t1) <= (t2)))
#define timegt(d1,t1,d2,t2) ((d1) > (d2) || ((d1) == (d2) && (t1) > (t2)))
#define timege(d1,t1,d2,t2) ((d1) > (d2) || ((d1) == (d2) && (t1) >= (t2)))
/* Days are numbered from 0=Sunday to 6=Saturday */
#define DAY_SUNDAY 0
#define DAY_MONDAY 1
#define DAY_TUESDAY 2
#define DAY_WEDNESDAY 3
#define DAY_THURSDAY 4
#define DAY_FRIDAY 5
#define DAY_SATURDAY 6
/* Interval values, specified in centiseconds */
#define INTERVAL_CENTI 1
#define INTERVAL_SEC 100
#define INTERVAL_MIN 6000
#define INTERVAL_HOUR 360000L
#define INTERVAL_DAY 8640000L
/* Function prototypes */
#ifdef __cplusplus
extern "C" {
#endif
long date_now (void);
long time_now (void);
Bool leap_year (int year);
int julian_date (long date);
int day_of_week (long date);
int week_of_year (long date);
int year_quarter (long date);
long next_weekday (long date);
long prev_weekday (long date);
word pack_date (long date);
word pack_time (long time);
long unpack_date (word packdate);
long unpack_time (word packtime);
long default_century (long *date);
long date_to_days (long date);
long days_to_date (long days);
time_t date_to_timer (long date, long time);
long timer_to_date (time_t time_secs);
long timer_to_time (time_t time_secs);
long timer_to_gmdate (time_t time_secs);
long timer_to_gmtime (time_t time_secs);
long time_to_csecs (long time);
long csecs_to_time (long csecs);
void future_date (long *date, long *time, long days, long csecs);
void past_date (long *date, long *time, long days, long csecs);
void date_diff (long date1, long time1, long date2, long time2,
long *days, long *csecs);
Bool valid_date (long date);
Bool valid_time (long time);
Bool date_is_future (long date, long time);
Bool date_is_past (long date, long time);
// char *timezone_string (void);
void local_to_gmt (long date, long time, long *gmdate, long *gmtime);
// void gmt_to_local (long gmdate, long gmtime, long *date, long *time);
struct tm *safe_localtime (const time_t *time_secs);
struct tm *safe_gmtime (const time_t *time_secs);
#ifdef __cplusplus
}
#endif
#endif

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