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NetBSD 6.1.5 - man page for timeoff (netbsd section 3)

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OFFTIME(3)			   BSD Library Functions Manual 		       OFFTIME(3)

NAME
     offtime, timeoff, timegm, timelocal -- convert date and time

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <time.h>

     struct tm *
     offtime(const time_t * clock, long int offset);

     struct tm *
     offtime_r(const time_t * clock, long int offset, struct tm *ret);

     time_t
     timeoff(struct tm * tm, long int offset);

     time_t
     timegm(struct tm * tm);

     time_t
     timelocal(struct tm * tm);

DESCRIPTION
     These functions are inspired by C standard interfaces named similarly.

     offtime() converts the calendar time clock, offset by offset seconds, into broken-down time,
     expressed as Coordinated Universal Time (UTC).

     offtime_r() is similar to offtime() but it places the returned struct tm * in the user sup-
     plied ret argument.

     timeoff() converts the broken-down time tm, expressed as UTC, offset by offset seconds, into
     a calendar time value.

     timegm() converts the broken-down time tm into a calendar time value, effectively being the
     inverse of gmtime(3).  It is equivalent to the C standard function mktime(3) operating in
     UTC.

     timelocal() converts the broken down time tm, expressed as local time, into a calendar time
     value.  It is equivalent to the C standard function mktime(3), and is provided for symmetry
     only.

SEE ALSO
     ctime(3), tm(3), tzset(3)

BSD					  April 14, 2011				      BSD
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