offtime(3) - NetBSD Manual Pages

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OFFTIME(3)              NetBSD Library Functions Manual             OFFTIME(3)


NAME

     offtime, offtime_r, 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 supplied 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)

NetBSD 9.1                      April 14, 2011                      NetBSD 9.1