Re: Question about time formatting

[Maren Purves <m.purves@jach.hawaii.edu>]

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,