trouble changing time regions

[Nick]

i am having a difficult time changing from CEST to PDT/PST   i have tried the following   date --set="Thur May 18 00:00:00 PDT 2000"   but get Thur May 18 00:00:00 CEST 2000   can't get rid of it, it is stuck from the install!   thankx for the tips