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External Data Source

Source

Regular Expression
^(?:-([0-9]{1,2})|([0-9]{4}))?(?:-?(?:([0-9]{2})?(?:-?([0-9]{2}))?|W([0-9]{2})(?:-?([1-7]))?|([0-9]{3})))?(?:T([0-9]{2})(?::?([0-9]{2})(?::?([0-9]{2}))?)?(?:[,\.]([0-9]+))?(?:(Z)|([+-])([0-9]{2})(?::?([0-9]{2}))?)?)?$