I'm on UTC+2+DST = UTC+3 here, so it must be related to DST handling.
I experience the issue on my office computer. But what is strange is that I have the same version of Linux Mint running on the same VM platform here at home, but without any issues.
Well, I will need to check all time / DST related settings on my office computer to see if there is anything wrong that could explain the strange behavior.