There is a case to not store a time in UTC: you schedule a meeting in the future and the local authorities change when they start DST in that location. Now your user gets the alert an hour too early or late for their meeting. The scenario is more fleshed out in the link below but I don't want to just copy and paste the article into the comment.

http://www.creativedeletion.com/2015/03/19/persisting_future...