/// <reference path=”XrmPage-vsdoc.js” />
function calMonths() {
//get the startdate field value in variable
var startday = xrm.page.getAttribute( “fieldname”).getValue();
// get todays date in variable
var today = new date();
// get the value of one day in (mili_second * second * min * hours)
var one_dat = 1000 * 60 * 60 * 24;
// get no of days in month
//get time
var starttime = startday.getTime();
var currenttime = today.getTime();
var diffrence = math.abs(currenttime – starttime);
noofdays = Math.round(diffrence / one_day);
noofmonths = Math.round(noofdays / one_month);
// set the noofmonths value in field
xrm.page.getAttribute( “new_calmonths”).setValue(noofmonths);
}
SOURCE : JUST2CODE.IN
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