So beginning 4/1, Eurex starts trading one hour later at 2:15am instead of 1:15am.

But why does Eurex trading still close at 22:00pm like before, instead of extending it by one hour and closing at 23:00pm?

The reason maybe that they only have extended the open and not the close. But yes, you are right, now the session starts 1 hour later, I've not seen this before your post, but I still only watch the "old" Eurex-session charts.

https://www.eurexchange.com/exchange-en/trading/trading-hours-extension

tr8er 

The reason maybe that they only have extended the open and not the close. But yes, you are right, now the session starts 1 hour later, I've not seen this before your post, but I still only watch the "old" Eurex-session charts. https://www.eurexchange.com/exchange-en/trading/trading-hours-extension

yeah after doing some more research, it seems to be the case that during summer time, trading hours are simply cut 1 hour short. pretty weird but at least now i know lol