Is there any sort of file I can modify manually to reflect the 1 hour change?
Initially, I wasn't going to do this little "primer, but then thought it wouldn't be that tough to create, so...
I won't go through all the steps you'd need to walk-through to change the EPG to suit your needs, but if you can figure out what I'm talking about here, you most likely know enough to accomplish that end.
First, you'll need to download and install something like Notepad++ (see below...it's free, but you can make a donation) to edit the EPG's XML file. Next, download the guide. I'd stick with its default name, guide.xml.
Set-up PVR Stalker client to use Local and then navigate to the guide.xml file you just downloaded. Go to TV > Guide and Clear data so the guide loads. Look within the guide for a few shows, and note the times. (They should be off by one hour as you indicated.) You're going to compare these times to the times in your edited guide, adjusting until you get things right.
Load guide.xml in Notepad++. There are over 150,000 lines of code, so the global search and replace will be your best friend for this task.
What you will be editing is the time offset in the guide. (You won't have to know coding to do this.) The lines Notepad++ will edit look like this:
<programme channel="I2.28460311.microsoft.com" start="
20160909233000 +0000" stop="
20160910000000 +0000">
Within Notepad++ be at the very top of the file, click Search and then choose Replace from the ensuing drop down menu. In the "Find what" area, enter +0000 (normally, this is the time offset from UTC time). In the "Replace with" area, enter +0100 and click Replace All. Save the edited file.
Now, clear your guide data so it will load the edited version of the guide. Compare the original program times to the edited program times (you should see a change of one hour), and determine which direction you need to go to get things aligned with your local time. If that didn't do it, try another search and replace. (The time offset can be negative, too, like -0100.) I'm thinking +0100 or -0100 will do the trick in your case.
After you've done this a few times, it shouldn't take more than 2 minutes to download, edit, save and load the guide.
Notepad++
Code:
https://notepad-plus-plus.org/download/v6.9.2.html