function CalculatePeriod() {
    var day = document.getElementById("PeriodDay").value;
    var month = document.getElementById("PeriodMonth").value;
    var year = document.getElementById("PeriodYear").value;
    var Avg = document.getElementById("PeriodAvg").value;
    var Result = document.getElementById("PeriodResult");
    var PeriodDate = new Date(year, month, day);
    PeriodDate.setDate(PeriodDate.getDate() + parseInt(Avg))

    var m = PeriodDate.getMonth()
    var ar = new Array(12)
    ar[0] = "يناير"
    ar[1] = "فبراير"
    ar[2] = "مارس"
    ar[3] = "ابريل"
    ar[4] = "مايو"
    ar[5] = "يونيو"
    ar[6] = "يوليو"
    ar[7] = "اغسطس"
    ar[8] = "سبتمبر"
    ar[9] = "اكتوبر"
    ar[10] = "نوفمبر"
    ar[11] = "ديسمبر"




    var d = PeriodDate.getDay()
    ar1 = new Array(7)
    ar1[0] = "الاحد"
    ar1[1] = "الاثنين"
    ar1[2] = "الثلاثاء "
    ar1[3] = "الاربعاء"
    ar1[4] = "الخميس"
    ar1[5] = "الجمعه"
    ar1[6] = "السبت"

    Result.innerHTML = "تاريخ الدروة القادمة " + ar1[d] + ":" + PeriodDate.getDate() + "/" + ar[m] + "/" + PeriodDate.getFullYear();
    
    
}