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#include <time.h> time_t mktime(struct tm *tptr); |
This function converts a time structure into the number of seconds since
00:00:00 GMT 1/1/1970. It also attempts to normalize the fields of
tptr. The layout of a struct tm is as follows:
struct tm {
int tm_sec; /* seconds after the minute [0-60] */
int tm_min; /* minutes after the hour [0-59] */
int tm_hour; /* hours since midnight [0-23] */
int tm_mday; /* day of the month [1-31] */
int tm_mon; /* months since January [0-11] */
int tm_year; /* years since 1900 */
int tm_wday; /* days since Sunday [0-6] */
int tm_yday; /* days since January 1 [0-365] */
int tm_isdst; /* Daylight Savings Time flag */
long tm_gmtoff; /* offset from GMT in seconds */
char * tm_zone; /* timezone abbreviation */
};
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If you don't know whether daylight saving is in effect at the moment
specified by the contents of tptr, set the tm_isdst member
to -1, which will cause mktime to compute the DST flag using the
data base in the `zoneinfo' subdirectory of your main DJGPP
installation. This requires that you set the environment variable
TZ to a file in that directory which corresponds to your
geographical area.
The resulting time, or -1 if the time in tptr cannot be described in that format.
| ANSI/ISO C | C89; C99 |
| POSIX | 1003.2-1992; 1003.1-2001 |