Creating an event for April 14 is giving a date of March 3.

I’ve installed Event+. I’ve added an event for April 14 from 19:00 to 21:00. When i move the cursor over the calendar entry for the event the pop-up shows the event to be scheduled for March 3, 5877521. Also if I click on the calendar entry to open it, the date displayed is March 3, 5877521.

How do I fix this?