Experimental Physics and
Industrial Control System

Something like this?

strftime(filename, sizeof(filename),
                    "/%Y%m%d/", gmtime( &now ) )

(we're reusing the filename here, this part is the UT date.
It really is
length=strftime etc.)

Aloha,
Maren

Eric Norum wrote:

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,

References:

Question about time formatting Eric Norum

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