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Operating Systems Linux Reading Daylight Saving Time in Linux using C/C++ Post 302382686 by fpmurphy on Thursday 24th of December 2009 10:22:33 AM
Old 12-24-2009
There are no standardized APIs for accessing the data you want from the relevant zoneinfo files. However if you do an Internet search for "ttisstdcnt" and "detzone" you will find plenty of examples of how it is done.
 

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ftime(3C)						   Standard C Library Functions 						 ftime(3C)

NAME
ftime - get date and time SYNOPSIS
#include <sys/timeb.h> int ftime(struct timeb *tp); DESCRIPTION
The ftime() function sets the time and millitm members of the timeb structure pointed to by tp. The structure is defined in <sys/timeb.h> and contains the following members: time_t time; unsigned short millitm; short timezone; short dstflag; The time and millitm members contain the seconds and milliseconds portions, respectively, of the current time in seconds since 00:00:00 UTC (Coordinated Universal Time), January 1, 1970. The timezone member contains the local time zone. The dstflag member contains a flag that, if non-zero, indicates that Daylight Saving time applies locally during the appropriate part of the year. The contents of the timezone and dstflag members of tp after a call to ftime() are unspecified. RETURN VALUES
Upon successful completion, the ftime() function returns 0. Otherwise -1 is returned. ERRORS
No errors are defined. USAGE
For portability to implementations conforming to earlier versions of this document, time(2) is preferred over this function. The millisecond value usually has a granularity greater than one due to the resolution of the system clock. Depending on any granularity (particularly a granularity of one) renders code non-portable. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
date(1), time(2), ctime(3C), gettimeofday(3C), timezone(4), attributes(5), standards(5) SunOS 5.10 24 Jul 2002 ftime(3C)
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