If you output the
Date object directly, its
toString function is called implicitly, giving you a string in the format
dow mon dd hh:mm:ss zzz yyyy, which may or may not be what you want.
DateFormat implementation lets you choose the date format that seems appropriate for your task. The method used in that code,
getDateInstance, gives you a formatter that uses a format based on the current locale. There are lots of other ways you can get
DateFormat instances, depending on what you want to do, but that one is a reasonable general-purpose formatter for dates in the current locale.
solved Why do i need DateFormat? [closed]