A: 

in smart gwt u can use java classes.

this date will be on client side date .

This will work.....

sagar
+1  A: 

You can call Javascript method using JSNI:

public native String getLocaleDateString() /*-{
    return new Date().toLocaleDateString();
}-*/;

GWT 2.1 will introduce the new JsDate class:

JsDate.create().toLocaleDateString();
axtavt