CalDAV: Time-Zone wrong


I have an issue with wrong time zones for calendar events created in eM client for a Synology CalDav calendar:

  1. Creating an event in eM client at 10:00 tz “Berlin” leads to an event stored in the Synology calendar starting at 11:00 tz “W. Europe Standard Time”. In eM Client it stills shows tz “Berlin”.
  2. Creating an event in Synology calendar directly at 10:00 tz “Berlin” shows up correctly (!) in eM client at 10:00 tz “Berlin” → so the issue is ONLY when an event is created in the eM client.

Can it be an issue with daylight saving as Berlin is on UTC+2 until End of October?

Kind regards,

Bumping the thread as it is still unsolved.