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This is a compatibility issue. Zend_Validate_Date doesn't accept Zend_Date object but it did in version 1.8.X
Posted by Thomas Weidner (thomas) on 2009-08-18T23:47:09.000+0000
The API states that isValid accepts "strings" and nothing more.
Additionally a date object would not have passed the preg_match check.
Posted by Thomas Weidner (thomas) on 2009-08-18T23:47:52.000+0000
Changing from Bug to Improvement
Posted by Thomas Weidner (thomas) on 2009-08-20T13:14:05.000+0000
Added with r17695