datetimepicker with displayFormat always return error msg?

[Emi Lu]

Hello List,

Tried datetimepicker, whenever I give the displayFormat="yyyy-MM-dd", 
always get the following warning:

Invalid field value for field "todayDate".

Something wrong with my code?

my code:
<s:datetimepicker name="todayDate"
   label="TestDate (yyyy-MM-dd)"
   displayFormat="yyyy-MM-dd"/>

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