Formats dt according to formatString.
*
* Returns:
* the formatted date string.
* Throws:
* SysTimeFormatException if the formatting fails, e.g. because of an error in the format
* string.
* UtfException if formatString is not a correctly-formed UTF-8 string.
Formats dt according to formatString. * * Returns: * the formatted date string. * Throws: * SysTimeFormatException if the formatting fails, e.g. because of an error in the format * string. * UtfException if formatString is not a correctly-formed UTF-8 string.