On Time for the Exam

function onTimeForTheExam(input) {
   let hourExam = Number(input[0]);
   let minuteExam = Number(input[1]);
   let arriveHours = Number(input[2]);
   let arriveMinutes = Number(input[3]);

   let timeExam = hourExam * 60 + minuteExam;
   let timeArrive = arriveHours * 60 + arriveMinutes;

   let difference = Math.abs(timeArrive - timeExam);
   let hour = Math.floor(difference / 60);
   let min = difference % 60;

   if (timeExam < timeArrive) {
      console.log(`Late`);
      if (difference >= 60) {
         if (min < 10) {
            console.log(`${hour}:0${min} hours after the start`);
         } else {
            console.log(`${hour}:${min} hours after the start`);
         }
      } else {
         console.log(`${difference} minutes after the start`);
      }
   } else if (timeArrive === timeExam || timeExam - timeArrive <= 30) {
      console.log(`On time`);
      if (difference !== 0) {
         console.log(`${difference} minutes before the start`);
      }
   } else {
      console.log(`Early`);

      if (difference >= 60) {

         if (min < 10) {
            console.log(`${hour}:0${min} hours before the start`);
         } else {
            console.log(`${hour}:${min} hours before the start`);
         }

      } else {
         console.log(`${difference} minutes before the start`);
      }
   }
}
onTimeForTheExam(["9", "30", "9", "50"])