Hi,

Trying to schedule an event with:
Start Date: 2016-02-09 18:00:00
End Date: 2016-02-09 18:45:00

The error is:
DateTime::__construct(): Failed to parse time string (Y-0-2 16:i:0) at position 3 (-): Double timezone specification

The configuration is:
Joomla 3.4.8
CB 2.0.13
GroupJive 3.0.1.CI.2015.12.17.18.22.03.477.E.4.B.755

PHP version 5.6 (same error with 5.3, 5.4)
CB Time format set to hh:mm:ss (24 hours)
CB Date format set to YYYY-MM-DD

I found the right format. Date format should be YY-MM-DD and it works.

Cheers!