Not for events like shows, movies, work hours, etc.  An event starts and stops at a specific local time.  If the DST rules change then the UTC version will be wrong but the one stored in local time + TZ will be correct.<p>Intervals should be stored in UTC.  If you&#x27;re supposed to drop the control rods in a reactor in 24 hours you store the time it&#x27;s supposed to happen in UTC.  DST transitions and rule changes would mess this up if stored in local time.<p>Timestamps for logs and files should also always be UTC.