Hello Dear ...
When you add an item in K2 control panel in the admin joomla 2.5.7 and version 2.6.1 of k2
The following error occurred:

500 - An error has occurred.

DateTime :: __construct () [datetime. - Construct]: Failed to parse string team (10/15/2012 13:56:59) at position 0 (1): Unexpected character

I can not enter more items ...