As I am not as experienced with debian like many others I am
going to explain how to set the timezone on debian. It might be
useful for one or another too.
(Especially if you have
"installed" debian with debootstrap)
The package responsible for the timezone is tzdata.
I've found the information needed here. The other
informations you might find with google are a bit confusing - at
least for me. You can (re)configure it with
dpkg-reconfigure tzdata
Just answer the questions and have a lot of fun!