var AM = "AM";
var PM = "PM";

function clearData(){
    document.getElementById('ctl00_MainContent_txtDayStart').value = "";
    document.getElementById('ctl00_MainContent_txtHourStart').value = "";
    document.getElementById('ctl00_MainContent_txtMinuteStart').value = "";
    document.getElementById('ctl00_MainContent_txtSecondStart').value = "";
    document.getElementById('ctl00_MainContent_txtDayEnd').value = "";
    document.getElementById('ctl00_MainContent_txtHourEnd').value = "";
    document.getElementById('ctl00_MainContent_txtMinuteEnd').value = "";
    document.getElementById('ctl00_MainContent_txtSecondEnd').value = "";
}
function calculate(){
    var daysStart = parseFloat(document.getElementById('ctl00_MainContent_txtDayStart').value);
    var hoursStart = parseFloat(document.getElementById('ctl00_MainContent_txtHourStart').value);
    var minutesStart = parseFloat(document.getElementById('ctl00_MainContent_txtMinuteStart').value);
    var secondsStart = parseFloat(document.getElementById('ctl00_MainContent_txtSecondStart').value);
    var daysEnd = parseFloat(document.getElementById('ctl00_MainContent_txtDayEnd').value);
    var hoursEnd = parseFloat(document.getElementById('ctl00_MainContent_txtHourEnd').value);
    var minutesEnd = parseFloat(document.getElementById('ctl00_MainContent_txtMinuteEnd').value);
    var secondsEnd = parseFloat(document.getElementById('ctl00_MainContent_txtSecondEnd').value);
    var add = document.getElementById('ctl00_MainContent_rdbAdd').checked;
    var subtract = document.getElementById('ctl00_MainContent_rdbSubtract').checked;
    var error = "";
    document.getElementById('ctl00_MainContent_lblError').style.display = "none";
    var start;
    var end;
    var sumOrDiffInSeconds;
    var remaining;
    var dd;
    var hh;
    var mm;
    var ss;
    var result="";
    if((!isNaN(daysStart) || !isNaN(hoursStart) || !isNaN(minutesStart) || !isNaN(secondsStart)) && (!isNaN(daysEnd) || !isNaN(hoursEnd) || !isNaN(minutesEnd) || !isNaN(secondsEnd)))
    {
        daysStart = convertToZero(daysStart);
        hoursStart = convertToZero(hoursStart);
        minutesStart = convertToZero(minutesStart);
        secondsStart = convertToZero(secondsStart);
        daysEnd = convertToZero(daysEnd);
        hoursEnd = convertToZero(hoursEnd);
        minutesEnd = convertToZero(minutesEnd);
        secondsEnd = convertToZero(secondsEnd);

        start = daysStart*60*60*24 + hoursStart*60*60 + minutesStart*60 + secondsStart;
        end = daysEnd*60*60*24 + hoursEnd*60*60 + minutesEnd*60 + secondsEnd;
        if(add){
            sumOrDiffInSeconds = start + end;
        } else {
            sumOrDiffInSeconds = start - end;
        }

        dd = sumOrDiffInSeconds/(60*60*24);
        if(sumOrDiffInSeconds > 0)
        {
            dd = Math.floor(dd);
        } else {
            dd = Math.ceil(dd);
        }
        remaining = sumOrDiffInSeconds % (60*60*24);
        hh = remaining/(60*60);
        if(sumOrDiffInSeconds > 0){
            hh = Math.floor(hh);
        } else {
            hh = Math.ceil(hh);
        }
        remaining = remaining % (60*60);
        mm = remaining/(60);
        if(sumOrDiffInSeconds > 0)
        {
            mm = Math.floor(mm);
        } else {
            mm = Math.ceil(mm);
        }

        remaining = remaining % (60);
        ss = remaining;

        result = getFormatedDayHourMinutSeconds(dd, hh, mm, ss);

        document.getElementById('result').innerHTML = result;
        document.getElementById('resultDays').innerHTML = "or "+formatNumber(sumOrDiffInSeconds/(60*60*24))+" days";
        document.getElementById('resultHours').innerHTML = "or "+formatNumber(sumOrDiffInSeconds/(60*60))+" hours";
        document.getElementById('resultMinutes').innerHTML = "or "+formatNumber(sumOrDiffInSeconds/(60))+" minutes";
        document.getElementById('resultSeconds').innerHTML = "or "+formatNumber(sumOrDiffInSeconds)+" seconds";

        document.getElementById('resultDiv').style.display = "inline";
    } else {
         error="Please enter time 1 and time 2";
         document.getElementById('ctl00_MainContent_lblError').innerHTML = error;
         document.getElementById('ctl00_MainContent_lblError').style.display = "inline";
    }
}
function getFormatedDayHourMinutSeconds(dd, hh, mm, ss)
{
    var result = "";
        if(dd > 0 || dd < 0){
            result = result+" "+dd+ " Day";
            if(dd > 1 || dd < -1){
                result = result+"s";
            }
        }
        if(hh > 0 || hh < 0){
            result = result+" "+hh+ " Hour";
            if(hh > 1 || hh < -1){
                result = result+"s";
            }
        }
        if(mm > 0 || mm < 0){
            result = result+" "+mm+ " Minute";
            if(mm > 1 || mm < -1){
                result = result+"s";
            }
        }
        if(ss > 0 || ss < 0){
            result = result+" "+ss+ " Second";
            if(ss > 1 || ss < -1){
                result = result+"s";
            }
        }
    return result;
}
function convertToZero(field)
{
    if(isNaN(field)){
        return 0;
    }
    return field;
}
function timeNowStart(){
    var today = new Date();
    var hours24Format = today.getHours();
    var hours;
    var minutes = today.getMinutes();
    var seconds = today.getSeconds();
    var amPM;

    if(hours24Format > 12){
        hours = hours24Format - 12;
        amPM = PM;
        document.getElementById('ctl00_MainContent_ddlAmPmStart').selectedIndex = "1";
    } else {
        hours = hours24Format;
        amPM = AM;
        document.getElementById('ctl00_MainContent_ddlAmPmStart').selectedIndex = "0";
    }
    document.getElementById('ctl00_MainContent_txtStartTime').value = (today.getMonth() + 1) + '/' + today.getDate() + '/' +  today.getFullYear();
    document.getElementById('ctl00_MainContent_txtDateHourStart').value = hours;
    document.getElementById('ctl00_MainContent_txtDateMinuteStart').value = minutes;
    document.getElementById('ctl00_MainContent_txtDateSecondStart').value = seconds;
}
function clearDataDateTime(){
    document.getElementById('ctl00_MainContent_txtStartTime').value = "";
    document.getElementById('ctl00_MainContent_txtDateHourStart').value = "";
    document.getElementById('ctl00_MainContent_txtDateMinuteStart').value = "";
    document.getElementById('ctl00_MainContent_txtDateSecondStart').value = "";
    document.getElementById('ctl00_MainContent_txtDateHourEnd').value = "";
    document.getElementById('ctl00_MainContent_txtDateMinuteEnd').value = "";
    document.getElementById('ctl00_MainContent_txtDateSecondEnd').value = "";
}
function calculateDateTime(){
    var startTime = document.getElementById('ctl00_MainContent_txtStartTime').value;
    var startTimeArray;
    var hoursStart = parseFloat(document.getElementById('ctl00_MainContent_txtDateHourStart').value);
    var minutesStart = parseFloat(document.getElementById('ctl00_MainContent_txtDateMinuteStart').value);
    var secondsStart = parseFloat(document.getElementById('ctl00_MainContent_txtDateSecondStart').value);
    var daysEnd = parseFloat(document.getElementById('ctl00_MainContent_txtDateDayEnd').value);
    var hoursEnd = parseFloat(document.getElementById('ctl00_MainContent_txtDateHourEnd').value);
    var minutesEnd = parseFloat(document.getElementById('ctl00_MainContent_txtDateMinuteEnd').value);
    var secondsEnd = parseFloat(document.getElementById('ctl00_MainContent_txtDateSecondEnd').value);
    var add = document.getElementById('ctl00_MainContent_rdbDateTimeAdd').checked;
    var subtract = document.getElementById('ctl00_MainContent_rdbDateTimeSubtract').checked;
    var hours24FormatStart;
    var hoursr24FormatEnd;
    var hoursDifferences;
    var minutesDifferences;
    var secondsDifferences;
    var newDateTime;
    var result="";
    var result2="";
    var start;
    var end;
    var msec;
    var diff;
    var hh;
    var mm;
    var ss;
    var e = document.getElementById('ctl00_MainContent_ddlAmPmStart');
    var amPMStart = e.options[e.selectedIndex].value;
    var error = "";
    document.getElementById('ctl00_MainContent_lblDateTimeError').style.display = "none";

    if(startTime!="")
    {
         if((!isNaN(hoursStart) || !isNaN(minutesStart) || !isNaN(secondsStart)) && (!isNaN(daysEnd) || !isNaN(hoursEnd) || !isNaN(minutesEnd) || !isNaN(secondsEnd)))
         {
            if(hoursStart > 12 || hoursStart < 0)
            {
                error = error+"Starting hours must be greater or equal to 0 and less than or equal to 12.<br />";
            }
            if(minutesStart > 59 || minutesStart < 0)
            {
                error = error+"Starting minutes must be greater or equal to 0 and less than or equal to 59.<br />";
            }
            if(secondsStart > 59 || secondsStart < 0)
            {
                error = error+"Starting seconds must be greater or equal to 0 and less than or equal to 59.<br />";
            }

            if(error =="")
            {
                hours24FormatStart = hoursStart;
                if((amPMStart =="PM" && hoursStart < 12)|| (amPMStart =="AM" && hoursStart == 12))
                {
                    hours24FormatStart = hoursStart + 12;
                }

                startTimeArray = startTime.split("/");
                start =  new Date(startTimeArray[2], startTimeArray[0]-1, startTimeArray[1], hours24FormatStart, minutesStart, secondsStart);

                daysEnd = convertToZero(daysEnd);
                hoursEnd = convertToZero(hoursEnd);
                minutesEnd = convertToZero(minutesEnd);
                secondsEnd = convertToZero(secondsEnd);

                end = daysEnd*60*60*24 + hoursEnd*60*60 + minutesEnd*60 + secondsEnd;

                if(add){
                    start.setSeconds(start.getSeconds() + end);
                } else {
                    start.setSeconds(start.getSeconds() - end);
                }
                document.getElementById('result_datetime').innerHTML = formatDateTime(start);
                document.getElementById('resultDiv2').style.display = "inline";
            } else {
                document.getElementById('ctl00_MainContent_lblDateTimeError').innerHTML = error;
                document.getElementById('ctl00_MainContent_lblDateTimeError').style.display = "inline";
            }
        } else {
             error="Please enter starting time and ending time";
             document.getElementById('ctl00_MainContent_lblDateTimeError').innerHTML = error;
             document.getElementById('ctl00_MainContent_lblDateTimeError').style.display = "inline";
        }
    } else {
         error="Please enter starting time and ending time";
         document.getElementById('ctl00_MainContent_lblDateTimeError').innerHTML = error;
         document.getElementById('ctl00_MainContent_lblDateTimeError').style.display = "inline";
    }
}