Daylight savings time stared today and the alarm on my Z3v was correctly set to 0730. The alarm didn't go off though until 0830. I did set the alarm with google now, but around 8 o'clock i also checked the Alarm and Clock app and verified the correct alarm time was set and turned on. Then the alarm went off at 0830. It was a one time alarm and no other alarms were set.
If it was set to Google time and they didn't adjust the time on their end then this may account for the issue you had - I can however confirm that setting an alarm via the system Alarm app works