This weekend my Hero alarm went off an hour later than it should have, like it went off daylight savings time one week early. But it was only the time on the lock screen, not the big clock display. Even more strangely, this morning the large clock display changed to be one hour early.
I had tried resetting the time, based on location. No success. The Sprint rep tried several things. Solution? At the Sprint store they finally did a soft reset (remove battery and restart). It worked. So, now I am happy again.