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TIME(3) BSD Library Functions Manual TIME(3)
time -- get time of day
Standard C Library (libc, -lc)
The time() function returns the value of time in seconds since 0 hours, 0 minutes, 0 sec-
onds, January 1, 1970, Coordinated Universal Time.
A copy of the time value may be saved to the area indicated by the pointer tloc. If tloc is
a NULL pointer, no value is stored.
Upon successful completion, time() returns the value of time. Otherwise a value of
((time_t) -1) is returned and the global variable errno is set to indicate the error.
No errors are defined.
The time() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
A time() function appeared in Version 2 AT&T UNIX. It returned a 32-bit value measuring
sixtieths of a second, leading to rollover every 2.26 years. In Version 6 AT&T UNIX, the
precision of time() was changed to seconds, allowing 135.6 years between rollovers.
In NetBSD 6.0 the time_t type was changed to be 64 bits wide, including on 32-bit machines,
making rollover a concern for the far distant future only. Note however that any code mak-
ing the incorrect assumption that time_t is the same as long will fail on 32-bit machines in
BSD November 5, 2011 BSD
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