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/*
* Copyright (C) 1995. Bill Brown <brown@gis.uiuc.edu> & Michael Shapiro
*
* This program is free software under the GPL (>=v2)
* Read the file GPL.TXT coming with GRASS for details.
*/
#include <time.h>
#include "datetime.h"
extern struct tm *localtime();
extern struct tm *gmtime();
/*
** NOTE: the extern variable "timezone" seems to be treated
** differently by different OS, and the tm_zone element of struct tm
** is missing in some OS (IRIX), so we're converting localtime() and
** gmtime() structures to datetimes, then doing a difference to get the
** timezone offset. -Bill Brown 5/31/95
*/
/*!
* \brief
*
* Returns:
* 0 OK
* -1 local timezone info not available
*
* \param minutes
* \return int
*/
int
datetime_get_local_timezone (int *minutes)
{
struct tm *local, *gm;
time_t clock;
DateTime dtl, dtg, dtdiff;
time(&clock);
local = localtime(&clock);
datetime_set_type (&dtl,DATETIME_ABSOLUTE,DATETIME_YEAR,DATETIME_SECOND,0);
/* now put current {year,month,day,hour,minute,second} into local */
datetime_set_year (&dtl, (int)local->tm_year + 1900);
datetime_set_month (&dtl, (int)local->tm_mon + 1);
datetime_set_day (&dtl, (int)local->tm_mday);
datetime_set_hour (&dtl, (int)local->tm_hour);
datetime_set_minute (&dtl, (int)local->tm_min);
datetime_set_second (&dtl, (double)local->tm_sec);
gm = gmtime(&clock);
datetime_set_type (&dtg,DATETIME_ABSOLUTE,DATETIME_YEAR,DATETIME_SECOND,0);
/* now put current {year,month,day,hour,minute,second} into gmt */
datetime_set_year (&dtg, (int)gm->tm_year + 1900);
datetime_set_month (&dtg, (int)gm->tm_mon + 1);
datetime_set_day (&dtg, (int)gm->tm_mday);
datetime_set_hour (&dtg, (int)gm->tm_hour);
datetime_set_minute (&dtg, (int)gm->tm_min);
datetime_set_second (&dtg, (double)gm->tm_sec);
datetime_set_type (&dtdiff,DATETIME_RELATIVE,
DATETIME_DAY,DATETIME_SECOND,0);
datetime_difference (&dtl, &dtg, &dtdiff);
datetime_change_from_to(&dtdiff, DATETIME_MINUTE, DATETIME_MINUTE, 0);
*minutes = dtdiff.positive? dtdiff.minute: -dtdiff.minute;
return 0;
}
/*!
* \brief
*
* set mode/from/to ABSOLUTE/YEAR/SECOND
* set the local time into 'dt' does not set timezone.
*
* \param dt
* \return void
*/
void
datetime_get_local_time(dt)
DateTime *dt;
{
long clock;
struct tm *local;
/* first set dt to absolute full date */
datetime_set_type (dt,DATETIME_ABSOLUTE,DATETIME_YEAR,DATETIME_SECOND,0);
/* get the current date/time */
time(&clock);
local = localtime(&clock);
/* now put current {year,month,day,hour,minute,second} into dt */
datetime_set_year (dt, (int)local->tm_year + 1900);
datetime_set_month (dt, (int)local->tm_mon + 1);
datetime_set_day (dt, (int)local->tm_mday);
datetime_set_hour (dt, (int)local->tm_hour);
datetime_set_minute (dt, (int)local->tm_min);
datetime_set_second (dt, (double)local->tm_sec);
}
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