time reference change (local to UP1)

[eluser]ok3x[/eluser]
Hi, I have an app hosted on american server (east coast), but all users ale located in central Europe. Is there an easy way to set the time reference to UP1 (UTC + 1:00) so that all php functions such as date(), time() etc. provide "wanted" results? I won't have access to the server's php configuration, that's why it has to be set within CI.

I searched the forums, but it didn't help. Thx for reply