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External Data Source

Source

Regular Expression
^(((\d{4}-((0[13578]-|1[02]-)(0[1-9]|[12]\d|3[01])|(0[13456789]-|1[012]-)(0[1-9]|[12]\d|30)|02-(0[1-9]|1\d|2[0-8])))|((([02468][048]|[13579][26])00|\d{2}([13579][26]|0[48]|[2468][048])))-02-29)){0,10}$