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How to solve Date Issues in Java

Java already provides powerful functions in dealing with Date (also Time) problems.
So you can input a String (i.e. “2001.07.04 AD at 12:08:56 PDT”), and get the Date Object by Java Methods.
In contrast, you can also provide a Date Object (or long number, etc.), and print the date as required date format easily.

What you need to done is just define the format String, i.e. “yyyy-mm-dd HH:mm:ss”. 
(Pay attention to the capticals, because they mean different format).
Here is a simple demostration.
Reference Code
The Output Result is :
test1:  Long Number is 1318252354000
test2:  Formatted Date String is 2011-10-10 22:12:34
test3:  Long Number is 481822496000
test4:  Formatted Date String is AM 12:34:56 04/09/85 JST

From Javadoc of JDK, we can easily learn how to write the format String.
Be careful on how to control the length of the items: i.e. the “yy” means here display the year, and two digits will be displayed.
Also, the “/” or “-” (or others) which are not defined in the table, will mean the separator.