Recurring events defaulting to Jan 1, 1970

Hi,
My recurring monthly events are changing the date to January 1, 1970 for some reason.

See this page:
http://txhubcouncil.org/tch-events-2/

(I put in July 5, 2013 - August 5, 2014 for the "Monthly Dinner")

Weekly (called "Weekly Meet & Greet" on that page) seems fine.

One thing I was confused on. I put:
Repeat every Month
On Friday At 20:00 HH:mm

I wasn't entirely sure I was supposed to put "Friday" in that box. Or, like, something else. I also assumed it's a 24 hour clock?