Thai date show wrong.
Using Jamroom
Looks like your server does not have the thai language pack in stalled. I don't know what the correct language code is for thai, do you?
For turkish the correct code is 'tr_TR' so to add that language pack to a server you would login via SSH as 'root' and do
locale-gen tr_TR
locale-gen tr_TR.UTF-8update-locale
Ask your hosting company to add thai local to your server.