time_t
Defined in header <time.h> | ||
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typedef /* unspecified */ time_t; |
Real arithmetic type capable of representing times.
Although not defined by the C standard, this is almost always an integral value holding the number of seconds (not counting leap seconds) since 00:00, Jan 1 1970 UTC, corresponding to POSIX time.
Notes
The standard uses the term calendar time when referring to a value of type time_t.
Example
Show the start of the epoch.
#include <stdio.h>
#include <time.h>
#include <stdint.h>
int main(void)
{
time_t epoch = 0;
printf("%jd seconds since the epoch began\n", (intmax_t)epoch);
printf("%s", asctime(gmtime(&epoch)));
}
Possible output:
0 seconds since the epoch began Thu Jan 1 00:00:00 1970
References
- C17 standard (ISO/IEC 9899:2018):
- 7.27.1/3 Components of time (p: 284)
- C11 standard (ISO/IEC 9899:2011):
- 7.27.1/3 Components of time (p: 388)
- C99 standard (ISO/IEC 9899:1999):
- 7.23.1/3 Components of time (p: 338)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.12.1 Components of time
See also
| returns the current calendar time of the system as time since epoch (function) |
|
|
(C23)(C11) | converts time since epoch to calendar time expressed as local time (function) |
|
(C23)(C11) | converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC) (function) |
C++ documentation for time_t |
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