How do I get difference between two dates in android?, tried every thing and post

I saw all the post in here and still I can't figure how do get difference between two android dates.

This is what I do:

long diff = date1.getTime() - date2.getTime();
Date diffDate = new Date(diff);

and I get: the date is Jan. 1, 1970 and the time is always bigger in two hours...I'm from Israel so the two hours is timeOffset.

How can I get normal difference???