You don't need to change anything.
I'll try to give you a guide.
First, if you haven't already, download the VUCC, VU+ Control Centre:
https://www.vuplus-community.net/board/forums/vu-tools-settings.10/
Start up the VUCC.exe and you should get this screen:
Just type in your receivers IP Address and click connect.
Once you are connected, to your receiver, select the Telnet option, top left.
Wait a few seconds, until it's finished loading, then copy, and paste, or type in the command I gave you earlier:
opkg install --force-reinstall tzdata tzdata-core tzdata-europe
Press enter, twice on your PC keyboard, and let it run.
Once finished go to your receivers menu, and restart your receiver.
Your time problem should now be solved.
Please post back with an update, or if you experience any problems.