Convert any time to 24 or 12 hour format in Javascript

function TimeToHours(hours = 0, mins = 0, secs = 0, to12Hours = true) {

  let postfix = ""

  hours = Math.floor(hours) + Math.floor(mins / 60) + Math.floor(secs / 3600)
  hours %= 24

  mins = Math.floor(mins) + Math.floor(secs / 60)
  mins %= 60

  secs = Math.floor(secs)
  secs %= 60


  // Convert to 12hr
  if (to12Hours) {
    postfix = hours >= 12 ? " PM" : " AM"
    hours %= 12
    hours = hours ? hours : 12
  }

  
  // Convert to string
  hours = String(hours).padStart(2, '0');
  mins = String(mins).padStart(2, '0');
  secs = String(secs).padStart(2, '0');

  return `${hours}:${mins}:${secs}${postfix}`
}

Example

TimeToHours(14, 80, 71) --> 03:21:11 PM