I have a problem with VM Invoice. Same as giosto

I just installed a version of 2.0.26 VM invoice.
Using Joomla 2.5.11 and Virtuemart 2.0.20b
Every time I try to go in managing orders / invoices (Invoice / Order Management) I get the following error:

500 - Se ha producido un error.
DateTime::__construct(): Failed to parse time string (-001-11-30T00:00:00+00:00) at position 7 (-): Double timezone specification

Date zone are the same in my server than in Joomla config.

Same here, worked fine on previous versions but not after VM 2.0.26 update. Worst part, my subscription ended,

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@image-nation.com.au and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.