OFFTIME(3) Library Functions Manual OFFTIME(3)
NAME
offtime, timeoff, timegm, timelocalconvert date and time
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <time.h>
struct tm *
offtime(const time_t * clock, long int offset);
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).
 
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