Urgent Error after updating to Joomla 3.3.6

Hi there

After recent update I now see the following error whenever I try and make adjustment to a locations listing.

0 DateTime::__construct(): Failed to parse time string (-1-11-30 00:00:00) at position 5 (-): Double timezone specification

Planning on launching website in next 2 days and this ability to update listings is key.

Please help.

Thanks

Daniel

I am getting the same error DateTime::__construct(): Failed to parse time string (-001-11-29T23:59:56+00:00) at position 7 (-): Double timezone specification


using:
version com_GMapFP_J3_P_63
PHP Built On Linux som.someradiostation.com 2.6.32-042stab104.1 #1 SMP Thu Jan 29 12:58:41 MSK 2015 x86_64
Database Version 5.5.40-cll
Database Collation utf8_unicode_ci
PHP Version 5.4.32
Web Server Apache/2.2.27 (Unix) mod_ssl/2.2.27 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4
WebServer to PHP Interface cgi-fcgi
Joomla! Version Joomla! 3.3.6 Stable [ Ember ] 01-October-2014 02:00 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT

It only occurred on the edit page. I was able to enter new items and the other items had no problems with edit.
The two that did have a problem were ones that I made prior to upgrading to the pro version. I could not correct it on the back end either.
After deleting them the problem has not reoccurred.