The way Mudcat time-stamps and indexes messages, it can only deal with the one time zone. (Although it occasionally gets wibbly-wobbly)
If you can figure out how to change Mudcat's time on individual computers, please share. There are probably a few people are confused by having to add 5 hours onto the time. (Or less, or more, or if you're west of Mudcat central, subtract time.) Think of it sort of MCT (Mudcat Central Time), like GMT.