These objects represent an "absolute" moment in time, and they do not contain any timezone information by themselves.
When you want to display a date in a specific timezone, you can convert the Date object to a string for display by using a DateFormat object. You set the timezone on the DateFormat object, to let it know in what timezone you want to have the date displayed. For example:
Hs Raveendran wrote:In java web application while storing the date into a database and rendering from the database do we need to convert the date in to UTC format....
No you don't (or you almost certainly don't). As Jesper said, Java dates (and most database dates too) are an offset from a fixed point in time; and that time is already UTC (or as close as makes no difference).
It's much more likely that your rendering issues have to do with choosing the wrong timezone for display. For example, the database more than likely displays time according to its local timezone by default (and Java definitely does). If you want to see the time in UTC form, then you should follow his advice.
Isn't it funny how there's always time and money enough to do it WRONG?