This approach has problems when the UTC <-> local time mapping changes, e.g. when: - a timezone changes - users change their timezone Often what the user wan

This approach has problems when the UTC <-> local time mapping changes, e.g. when: - a timezone changes - users change their timezone Often what the user wants is that the "naive" local time stays the same (e.g. it's still 12am even if the timezone changes). Through not always.