youtubeLink.js

function toSecs(val) {
  val = val.split(':').reverse()

  const sec = parseInt(val[0])
  const min = parseInt(val[1] || 0)
  const hr  = parseInt(val[2] || 0)

  return ( (hr * 60 * 60) + (min * 60) + sec )
}

function youtubeLink(yt_id, start_stamp, end_stamp) {
  const start_secs = toSecs(start_stamp)
  const end_secs = end_stamp ? toSecs(end_stamp) : start_secs + 5
  if(yt_id && start_secs) {
    return (`https://www.youtube.com/embed/${yt_id}?start=${start_secs}&end=${end_secs}`)
  } else {
    return ('.')
  }
  
}