totime.js

function toTime(secs) {
  const s = secs % 60
  const m = (secs - s) / 60
  return [(m - (m % 60)) / 60, m % 60, s]
}

function test() {
  const tests = [8654, 0, 10, 600, 60, 987678987, 61]

  tests.forEach(time => {
    const result = toTime(time)
    const result2 = result[0] * 60 * 60 + result[1] * 60 + result[2]
    console.log(result)
    console.log(result2 === time)
  })
}

test()