Salesforce custom field error: - is not a valid value for the type xsd:dateTime

Error: '2008-09-06' is not a valid value for the type xsd:dateTime
Solution: I got correct result when inputting date format like this:-
2008-11-21T04:37:14-05:00

more on this issue :-

http://community.salesforce.com/sforce/board/message?board.id=NET_development&message.id=4069