Tvheadend

I struggle along (: But more and more is working like it should. I feel I am on the last thing I have to solve, but I seem te be out of options.

My EPG data is one hour off. For example, a show is starting at 14.00 hour but my guide shows it starting at 13.00 hour. I am in the Netherlands, so UTC+1 time zone. I run TVheadend on a Qnap NAS. The TVHeadend install is showing the correct time on the upper right corner.

What have I tried?
- In configuration > general -> base I checked 'update time'
In configuration -> DVB Inputs -> networks I have tried 'EIT time offset' options 'Local' and 'UTC +1' and after that I tried forcing updating EPG data

Are there any other options I need to look in to?

EDIT: sometimes the solution is right in front of you but you cannot see it. I've set it to UTC and all is well. Maybe something related to daylight savings.