thank you guys for your quick replies.

@Brown Dog

I tried searching the forum, but unfortunately nothing understandable was found, maybe you have some link to put me on to. I edited sys.txt before, but never data.zip.

@czensi

Cheers to you my friend. Your reply was very helpful, i solved time problem. I have one more thing to ask you, have you experience time zone differences in different countries. for example, i need to travel to greece, and there is a time difference one hour ahead of us. after the line i just inserted, will everything be ok. with time zones?