Personality type by time of day?

Could you elaborate on time of day relevance? I have not read these before and mine is rather sad and disconcerting being that I am a morning born dog in snake sign at 10:44 according to Chinese Beijing time.

I have not read these on other Chinese Zodiac websites? Are these concrete and 'set in stone' or how does a person change these aspects of himself or herself?

Thank you for any help.