steps to reproduce:

1. set current timezone to a timezone with DST
   1. this means that there is tipycally one hour in the year that does not exist (when the local clock is moved forward).
2. when I try to insert or update a timezone value to the non-existing hour, I get the generic "Invalid datetime format: 1292 Incorrect datetime value" error message.
   this does not really help understanding the issue, as the time value entered is formally valid, but is non-existing in the current timezone

expected behaviour:

1. when I try to insert or update a timezone value to the non-existing hour, I get a more specific error message, that hints to the reason of the issue, e.g.

"Invalid datetime format: 1292 datetime value does not exist in the XX timezone - check DST rules"