Comment 2 for bug 1562891

Events created on the phone uses the phone tz set during the creation. It will stay that way even if you change the phone TZ.

For example:
     if you phon tz is UTC and you created a event on 1PM the event will be displayed at 1PM.
     After change your phone TZ to UTC+1 the events will still on the UTC TZ and they will be displayed at 1PM + 1 = 2PM.

Events need to be TZ specific they can not be floating times for several reasons (Imagine importing events without the orignal tz).