At the very bottom of the list of threads there's a note of the current 'Mudcat Time', currently: Mudcat time: 9 May 2017 - 11:13 AM EDT
This can be compared to the time on the most recent posting for how long since the last post, or compared to your local time to know what time difference to allow for.
By the time I type all of this (on two fingers) it will probably be a few minutes out from the time stamp I quoted above!

Cheers