How to calculate difference between two date from DatePicker widget
问题 I've a problem with my GWT project: i'm only interested to calculate the difference between two date (in days) from two DatePicker Widget. This is my code, i take it mainly from here: http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/datepicker/client/DatePicker.html // Create a date picker "FROM: " final DatePicker datePicker1 = new DatePicker(); datePicker1.addValueChangeHandler(new ValueChangeHandler<Date>() { public void onValueChange(ValueChangeEvent<Date> event) { Date date1