time_t - cppreference.com (original) (raw)
| | | | | ------------------------------------ | | | | 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.
[edit] Notes
The standard uses the term calendar time when referring to a value of type time_t.
[edit] 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
[edit] 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