[foepys]

You are assuming that timezones don't change ever in relation to UTC. This is wrong. Timezones change all the time.

When I set an alarm for any time in CEST in 2022 and convert this to UTC before saving it, it will very likely ring at the wrong time, simply because CEST will probably not exist by then and be replaced by CET due to the EU getting rid of DST.

[lokedhs]

But an alarm is not supposed to use timestamps. An alarm is set for a certain time in a certain location. In otherwords, a wallclock time. Not a timestamp.