Extract time from RunStart of a job

Hello,

with j.getRunStart().getUTCMilliSecs() I get the starttime of a job with date, time and timezone.

I only need the time and timezone. But I want to calculate with the starttime of the job, so "DateTimeZone.formatDuration" is not an option.

How I can get the starttime of a job in format "hh:mm:ss timezone" but not as string.

Thanks and best regards

Dana Ullrich