I have two calendars on Jorte -- one for my business and one for my personal life. I make an entry for the business account, and it is set for GMT - 6 (Central time). If I make an entry for the personal account, it is set for GMT.
I tried reading the Jorte help, but it seems to be written in some language that uses English words, but not English syntax and grammar.
In case it makes a difference, I am running Android version 2.3.4 on a Droid 2 and Jorte is version 1.4.5.
Ed