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dateformat

how can make the grid date cells using format of mm/dd/yyyy
instead of dd/mm/yyyy

<script>
var mygrid;
function doInitGrid(){
    mygrid = new dhtmlXGridObject('mygrid_container');
    mygrid.setImagePath("codebase/imgs/");         
    mygrid.setHeader("Select,Store,FOGID,In Store Date");
    mygrid.attachHeader("#rspan,#text_filter,#text_filter,#rspan");
    mygrid.setInitWidths("60,50,80,100");
    mygrid.setColAlign("center,center,center,right");
    mygrid.setSkin("light");     
    mygrid.setColTypes("ch,ro,ro,dhxCalendarA");
    mygrid.setColSorting("int,str,str,date");
    mygrid.setDateFormat("%m/%d/%y");
    mygrid.init();
    mygrid.loadXML("data/storeinstore.xml");
}
</script>

The setDateFormat will set format for dhxCalendar and dhxCalendarA column types. 
In you case correct command will be
  mygrid.setDateFormat("%m/%d/%Y");

Beware that setDateFormat command supported only in pro version.