Question about time formatting

[Eric Norum <wenorum@lbl.gov>]

I have an application that creates log files with names based on the current time.  To avoid problems with DST changes I want to use UTC.  Here's the code I'm now using:

/*
 * This thread rotates the log files every half hour.
 */
static void
logFileRotater(void *arg)
{
    epicsTimeStamp now;
    struct tm tm;
    unsigned long nsec;
    int idx;

    for (;;) {
        epicsTimeGetCurrent(&now);
        epicsTimeToGMTM(&tm, &nsec, &now);
        epicsTimeFromTM(&now, &tm, nsec);
        idx = (logNameIndex + 1) % LOGNAME_COUNT;
        epicsTimeToStrftime(logName[idx], sizeof logName[0], "%F_%T", &now);
        logNameIndex = idx;
        epicsThreadSleep(IRM_LOGFILE_DURATION);
    }
}


This works, but swapping back and forth between time representations like that seems a little clumsy.   Is there a better approach I could use to convert an EPICS time stamp into a UTC date and time?

Thanks,
-- 
Eric Norum
wenorum@lbl.gov