Events date & day of week incorrect

It's the strangest thing I've ever seen. The calendar dates on my Events+ calendar are off by 1 day. For example, Friday Jan 4 (last Fri) is displaying as Fri Jan 5. Jan 5 is a Saturday!

Just to confirm it wasn't my server, or WordPress in general, I added a post to the system and the correct date appears. Help!

OK never mind
. Someone changed the WP General setting to start the week on Monday, not Sunday, so the calendar was displaying the correct date/day of week, just everything was shifted to the left in the calendar.