On Time for Exam

function exam(examHour,examMinutes,arriveHour,arriveMinutes) {

    examHour = Number(examHour);
    examMinutes = Number(examMinutes);
    arriveHour = Number(arriveHour);
    arriveMinutes = Number(arriveMinutes);

    let allExamMins = ((examHour * 60) + examMinutes);
    let allArriveMins = ((arriveHour * 60) + arriveMinutes);
    let time = '';
    let hours = 0;
    let minutes = 0;
    let minsDifference = 0;


    if(allArriveMins > allExamMins) {
        time = 'Late';
        console.log(time);

    } else if(allExamMins - allArriveMins <= 30) {
        time = 'On time';

    } else {
        time = 'Early';
        console.log(time);
    }

let result = Math.abs(allArriveMins - allExamMins);

    if(time === 'Late') {
        if(examHour <= arriveHour) {
            hours = arriveHour - examHour;
            minutes = arriveMinutes - examMinutes;
            minsDifference = allArriveMins - allExamMins;

            if(minsDifference < 60){
                console.log(`${minsDifference} minutes after the start`);

            }else if(minsDifference >= 60 && minutes < 10) {
                    console.log(`${hours}:0${minutes} hours after the start`);

                 } else {
                        minutes = minsDifference % 60;
                        console.log(`${hours}:${minutes} hours after the start`);
                     }

            }

    }   if((time === 'On time') && (examMinutes === arriveMinutes)) {
        console.log(`On time`);

    } else if(time === 'On time' && minsDifference <= 30) {
        minsDifference = allExamMins - allArriveMins;
        console.log('On time');
        console.log(`${minsDifference} minutes before the start`);

    } if(time === 'Early') {
        if(allExamMins - allArriveMins < 60) {
            minsDifference = allExamMins - allArriveMins;
            console.log(`${minsDifference} minutes before the start`);

        } else {
            hours = examHour - arriveHour;
            minutes = examMinutes - arriveMinutes;
            if(minutes < 10){
            console.log(`${hours}:0${minutes} hours before the start`);
        } else {
            console.log(`${hours}:${minutes} hours before the start`);
        }
        }
    }
}