on time

function onTimeForExam(hourExam, minExam, hourSchool, minSchool) {


hourExam = +(hourExam);
minExam = +(minExam);
hourSchool = +(hourSchool);
minSchool = +(minSchool);


let examInMins = hourExam * 60 + minExam;
let arrivalMins = hourSchool * 60 + minSchool;
let diff = examInMins - arrivalMins;

if (diff < 0) {
    console.log("Late");
    if (diff > -60) {
        console.log(`${Math.abs(diff)} minutes after the start`);
    }
        else {

            let hours = (Math.floor(Math.abs(diff) / 60));
            let min = Math.abs(diff % 60);
            if (min < 10) {
                console.log(`${hours}:0${min} hours after the start`);
                }
                else {
                    console.log(`${hours}:${min} hours after the start`);
                }
        }
    }


                    else if (diff <= 30) {
                             console.log("On Time");
                             if (diff > 0) {

                                console.log(`${diff} minutes before the start`);
                             }
                            }
else
{
    console.log("Early");

    if (diff < 60) {
    console.log(`${diff} minutes before the start`);
    }
    else
    {
        let hours = Math.floor(diff / 60);
        let min = diff % 60;
        if (min < 10) {
        console.log(`${hours}:0${min} hours before the start`);
        }
        else {
            console.log(`${hours}:${min} hours before the start`);
        }
    }
}



}
onTimeForExam(9, 30, 10, 50);
onTimeForExam(9, 00, 8, 30);
onTimeForExam(16, 00, 15, 00);
onTimeForExam(9, 00, 9, 00);