I\'m trying to understand two things:
SimpleDateFormat is not lenient)
SimpleDateFormat API:
For parsing, if the number of pattern letters is more than 2, the year is interpreted literally, regardless of the number of digits. So using the pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.
As for lenient, when it's set to false parse throws exception for invalid dates, eg 01/32/12, while in lenient mode this date is treated as 02/01/12. SimpleDateFormat uses Calendar internally, details about leniency can be found in Calendar API.