Convert seconds into format HH:MM:SS in JavaScript. Works for negative values as well

index.js

function nSecToTime(s) { 
  let seconds = s
  s = Math.abs(s)

  let t = [0, 0, 0]
  let r = s % 3600
  
  t[0] = Math.floor(s / 3600)
  t[1] = Math.floor(r / 60)
  r = r % 60
  t[2] = r
  
  return (seconds < 0 ? "-" : "") + (t[0] < 10 ? "0" : "") + t[0]+":"+(t[1]<10?"0"+t[1]:t[1])+":"+(t[2]<10?"0"+t[2]:t[2])
}

let s = 60 * 60 + 5
console.log(nSecToTime(-s))