NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO |
|
|
difftime(3) Library Functions Manual difftime(3)
difftime - calculate time difference
Standard C library (libc, -lc)
#include <time.h> double difftime(time_t time1, time_t time0);
The difftime() function returns the number of seconds elapsed between time time1 and time time0, represented as a double. Each of the times is specified in calendar time, which means its value is a measurement (in seconds) relative to the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │difftime() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C89, SVr4, 4.3BSD.
On a POSIX system, time_t is an arithmetic type, and one could just define #define my_difftime(t1,t0) (double)(t1 - t0) when the possible overflow in the subtraction is not a concern.
date(1), gettimeofday(2), time(2), ctime(3), gmtime(3),
localtime(3)
Linux man-pages 6.04 2023-04-03 difftime(3)
Pages that refer to this page: ctime(3), time_t(3type)