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mktime
Syntax
Defined in
Description
Example
6-56
#include
<time.h>
time_t
*mktime{timeptr)
struct tm
*timeptr;
mktime.c in rts.src
Convert to Calendar Time
The mktime function converts a broken-down time, expressed as local time,
into proper calendar time. The timeptr argument points to a structure that
holds the broken-down time.
The function ignores the original values of tm.....wday and tm.....yday, and
does not restrict the other values in the structure. After successful com-
pletion, tm.....wday and tm.....yday are set appropriately, and the other com-
ponents in the structure have values within the restricted ranges. The final
value of tm-mday is not sent until tm.....mon and tm.....year are determined.
The return value is encoded as a value of type time-to If the calendar time
cannot be represented, the function returns the value -1.
This example determines the day of the week that July 4, 2001, falls on.
#include
<time.h>
static const char *const wday[]
= (
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday" };
struct tm time-str;
time-str.tm.....year
time_str.tm-mon
time_str.tm-mday
time-str.tm.....hour
time_str.tm-min
time-str.tm.....sec
time-str.tm.....isdst
mktime(&time-str) ;
2001 - 1900;
7 ;
4 ;
0;
0;
1;
1;
printf ("result is %s\n", wday[time-str.tm.....wday])i
/* After calling this function, time-str.tm.....wday
contains the day of the week for July 4, 2001 */
For more information about the functions and types that the
time. h
header declares, see Section 6.1 .10 on page 6 -7.
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