Convert military and standard times

index.js

// 3:30 pm  =>  15:30
const standardToMilitary = standardTime => {
  const [time, period] = standardTime.split(' ')
  const [hours, minutes] = time.split(':')
​
  if (period === 'am') {
    return `${hours == 12 ? 24 : hours}:${minutes}`
  } else {
    return `${parseInt(hours) === 12 ? 12 : parseInt(hours) + 12}:${minutes}`
  }
}
  
// 15:30  =>  3:30 pm
const militaryToStandard = time => {
  const [hours, minutes] = time.split(':')
​
  if (parseInt(hours) < 12 || parseInt(hours) === 24) {
    return `${hours == 0 || hours == 24 ? 12 : hours}:${minutes} am`
  } else {
    return `${hours % 12 === 0 ? 12 : hours % 12}:${minutes} pm`
  }
}