Created attachment 125928 [details]
Sample database

Date values in a database are changed automatically when the time zone of the system is changed to an hour earlier, and does not change back when you change the time zone back. I consider this a data loss, because with a complex database there is no way to know in which table dates were changed and how often.

Steps:
1. Load the attached database. Check the dates in the table DateTable
2. Close the database file
3. Change the time zone by -1 hour
4. Load the attached database. See that all dates have changed
5. Close the database file
6. Change the time zone back to the original one
7. Load the attached database. See that all dates did not change back to the original values