DateTime _Sdate = ["Sdate"] //this one here does not work
newDef = jobDef.Items.Add();
newDef["Sdate"] = "01/01/2015"; // i want to initialize this field to _Sdate
newDef["Ndate"] = "07/06/2015";
newDef["Cdate"] = calcDay() // I have this function in my project