java - SmartGwt: add days to date -

how add days date in smartgwt. found this question , found can use calendarutil.adddaystodate(datetoaddto, daystoaddtodateasinteger)); adddaystodate() static void. point of method can "add days date" if not return anything?

how use method? want this.

date newdate = datetoaddto + daystoaddtodate; 

here simplified version of code.

if (listgridrecord.getattribute("expirationdays") != null) {     calendarutil.adddaystodate((date) enddate.getvalue(), integer.parseint(listgridrecord.getattribute("expirationdays")));      listgridrecord.setattribute("expirationdate", (date) enddate.getvalue()); } else {     listgridrecord.setattributeasjavaobject("expirationdate", null); } 

here link javadocs

this method changes object passed parameter.

date date = new date(); long checkbeforechange = date.gettime(); calendarutil.adddaystodate(date, 1); long checkafterchange = date.gettime(); if(checkbeforechange != checkafterchange)     window.alert("it works ;)"); 

your code should that:

if (listgridrecord.getattribute("expirationdays") != null) {     date tmpdate = enddate.getvalue();     calendarutil.adddaystodate(tmpdate, integer.parseint(listgridrecord.getattribute("expirationdays")));     listgridrecord.setattribute("expirationdate", tmpdate); } else {     listgridrecord.setattributeasjavaobject("expirationdate", null); } 

when doing (date) enddate.getvalue() copy of date object don't see change.