With a time system named "Timestamp" you can convert timestamp to date or do opposite. Also you can use "User defined formats" which provides you with comfortable and efficient calculation.
This application has "Timestamp Widget" you can place the widget to homescreen and you can see Timestamp anywhere anytime
etc.
In addition this application supports "Datestamp" which is similar to Timestamp except of it is hexadecimal.
This application supports almost all of Android version.
If this app has any error please send e-mail to me.