The meaning of the date will not change compared to the UTC absolute coordinates, but usually users care only about their local time. If you set an alarm to wake you up at 8:00, you expect it to ring at 8am your time every day. What if in future user's local time zone gets changed - say if daylight savings are abandoned, as many countries consider doing - The user might not be in +2 offset anymore and when you convert it to the local time the alarm will ring at 7am or 9am instead of 8:00. It's definitely not what user would expect.