onTime fot the exam

function onTime(StartExHr, StartExMin, comeHr, comeMin) {

    StartExHr = Number(StartExHr);
    StartExMin = Number(StartExMin);
    comeHr = Number(comeHr);
    comeMin = Number(comeMin);



    let examTime = StartExHr * 60 + StartExMin;
    console.log(examTime);
    let comeTime = comeHr * 60 + comeMin;
    console.log(comeTime);
    let minDiff = examTime - comeTime;
    console.log(minDiff);
    let hr = Math.floor(minDiff / 60).toFixed(0);
    hr = Math.abs(hr);
    let min = Math.abs(minDiff % 60);
    if (minDiff > 30) {
        console.log("Early");
    } else if (minDiff >= 0 && minDiff <= 30) {
        if (minDiff==0){
               console.log("On time");
        }else {
            console.log("On time");
        }
    } else {
        console.log("Late");
    }
    if (hr > 0) {
        if (min < 10) {
            console.log(hr + ":0" + min + " hours");
        } else {
            console.log(hr + ":" + min + " hours");
        }
    } else if (min > 10) {
        console.log(min + " minutes");
    }
    if (minDiff > 0 && minDiff != 0) {
        console.log(" before the start");
    } else if (minDiff < 0 && minDiff != 0) {
        console.log(" after the start");
    }
}



//onTime("9", "30", "9", "50");
//onTime("9", "00", "8", "30");
//onTime("16", "00", "15", "00");
onTime("11",
    "30",
    "12",
    "29")