OnTimeForTheExam

function solve(examHour, examMinutes, arriveHour, arriveMinutes){
    examHour = Number(examHour);
    examMinutes = Number(examMinutes);
    arriveHour = Number(arriveHour);
    arriveMinutes = Number(arriveMinutes);

    let examInMinutes = examHour * 60 + examMinutes;
    let arriveInMinutes = arriveHour * 60 + arriveMinutes;
    let late = arriveInMinutes - examInMinutes;
    let early = examInMinutes - arriveInMinutes;
    let diff = Math.abs(late);
    let hours = parseInt(diff / 60);  // взима целочислената част от делението
    let minutes = diff % 60;

    const zeroPad = (num, places) => String(num).padStart(places, '0')
    //https://stackoverflow.com/questions/2998784/how-to-output-numbers-with-leading-zeros-in-javascript

    if (late > 0){
        console.log(`Late`)
        if (late <= 59){
            console.log(`${late} minutes after the start`)
        }
        else{
            console.log(`${hours}:${zeroPad(minutes, 2)} hours after the start`)
        }
    }
    else if (early >= 0 && early <= 30){
        console.log(`On time`)
        if (early != 0){
            console.log(`${early} minutes before the start`)
        }
    }
    else if (early > 30){
        console.log(`Early`)
        if (early <= 59){
            console.log(`${early} minutes before the start`)
        }
        else{
            console.log(`${hours}:${zeroPad(minutes, 2)} hours before the start`)
        }
    }
}