Alarm goes off an hour early when set for weekdays

This sounds bizarre but since the last upgrade my set alarm for the weekdays now goes off at 0500 instead of 0600. The time I have in the alarm is correct at 0600, my mac time is correct, the time zone in the itouch is correct, the time on the itouch is correct, but the itouch just goes off for no good reason at 0500 instead of 0600.