countingMins.js

countingMins.js

function CountingMinutes(str) { 

  const convertTo24hours = (time) => {
    let [ hours, mins ] = time.split(':')
    if (mins.includes('pm') && hours >= 1 && hours <= 11) {
      hours = parseInt(hours) + 12
    }
    if (mins.includes('am') && hours == 12) {
      hours = '00'
    }
    return `${hours}:${mins.substring(0, mins.length - 2)}`
  }

  const minsSinceMidnight = (t) => {
    let [ hours, mins ] = t.split(':')
    return (parseInt(hours) * 60) + parseInt(mins)
  }

  const getHours = (t) => parseInt(t.split(':')[0])
  const getMins = (t) => parseInt(t.split(':')[1])

  let [ t1, t2 ] = str.split('-')
  t1 = convertTo24hours(t1)
  t2 = convertTo24hours(t2)

  let t1MinsSinceMidnight = minsSinceMidnight(t1)
  let t2MinsSinceMidnight = minsSinceMidnight(t2)

  if (t2MinsSinceMidnight < t1MinsSinceMidnight) {
    return minsSinceMidnight(t2) - (((getHours(t1) - 24) * 60) + getMins(t1))
  } else {
    return t2MinsSinceMidnight - t1MinsSinceMidnight
  }

}