Exam

function Exam(input){
  let hourExam = Number(input.shift());
  let minutesExam = Number(input.shift());
  let hourArrived = Number(input.shift());
  let minutesArrived = Number(input.shift());

  let examtotalMins = hourExam * 60 + minutesExam;//subirat se minutite
  let arrtotalMins = hourArrived * 60 + minutesArrived;
  let time = examtotalMins - arrtotalMins;

  if(time < 0){
    console.log('Late');
    if(time > -60){
     console.log(`${Math.abs(time)} minutes after the start`);
    }else{
      let h = Math.abs(parseInt(time / 60));//chasovete
      let m = Math.abs(time % 60);// ostatuk na time sa minutite.
      if(m < 10){
        console.log(`${h}:0${m} hours after the start`);
      }else{
        console.log(`${h}:${m} hours after the start`);
      }

    }
  }else if(time === 0 || time <= 30){
    console.log('On time');
    if(time > 0){
     console.log(`${time} minutes before the start`);
    }
  }else {
    console.log('Early');
  if(time < 60){
     console.log(`${time} minutes before the start`);
    }else{
      let h = parseInt(time/60);
      let m = time % 60;
      if(m < 10){
        console.log(`${h}: 0${m} hours before the start`);
      }else{
        console.log(`${h}: ${m} hours before the start`);
      }
    }
  }
}
Exam([9,30,9,50]);
Exam([9,00,8,30]);
Exam([16,00,15,00]);
Exam([10,00,10,00]);