2 つの Go time.Time オブジェクトの差を計算するにはどうすればよいですか?

diff := t2.Sub(t1)
formattedDiff := time.Time{}.Add(diff)
fmt.Println(formattedDiff.Format("15:04:05"))

func diff(a, b time.Time) (year, month, day, hour, min, sec int) {
  // Calculate the difference in seconds
  diffSeconds := int(a.Sub(b).Seconds())

  // Calculate days and remaining seconds
  days := diffSeconds / (24 * 3600)
  remainingSeconds := diffSeconds % (24 * 3600)

  // Calculate hours and remaining seconds
  hours := remainingSeconds / 3600
  remainingSeconds %= 3600

  // Calculate minutes and remaining seconds
  minutes := remainingSeconds / 60
  seconds := remainingSeconds % 60

  // Convert days to years, months, and remaining days
  yearDays := days / 365
  yearSeconds := yearDays * 365 * 24 * 3600
  months := (days - yearDays*365) / 30
  daySeconds := (days - yearDays*365 - months*30) * 24 * 3600

  return yearDays, months, days, hours, minutes, seconds
}