Error adding tax rate if date format changed

[carbon]

If date format is changed in the shop admin / configuration from %m/%d/%y to %d/%m/%y

Then the following error occurs when trying to add a new tax rate calculation (under products)

DateTime::__construct() [datetime.--construct]: Failed to parse time string (19/10/11) at position 0 (1): Unexpected character

Joomla Version 1.7.2
Virtuemart 2.0.0-RC-2i

[manch]

I had the same error message...but with editing gift coupons.

Manch