Well, when I enable that line, it makes it 2 hours off then. That is why I had to add the +2 to the timediff in the original file. I re-added that and all is well now.
My server is set at GMT and so is the setting in the Admin CP.
Aren't there ay cities in the +5 timezone anywhere? I noticed there aren't any listed there with the changes she made.
I will run this a few days and check it out and let you know what I find out.
Also, just for yucks, try setting DST to always off in your Admin CP (since it is for you) and see what happens.