date in pdf

hi,

we use the plugin with the pdf extension
everything works well except the date in the pdf
we use all for a takeout order in a san francisco located restaurant…and it seems as the system would use the europian timestamp
every order is dated to one day later

what might be the error?

cheers
martin

http://ww.wp.xz.cn/plugins/wp-ecommerce-shop-styling/