get the difference between two unix dates in the style of "x [second|minute|hour|month|year]s ago"

timeDiff.js

// timeDiff - get the difference between two "unix" dates
// version: 1.0.0
// author: Mohammed Al Ashaal
function timeDiff(t_new, t_old) {
  t = {
    second: 1,
    minute: 1 * 60,
    hour: 	1 * 60 * 60,
    day: 	  1 * 60 * 60 * 24,
    week:   1 * 60 * 60 * 24 * 7,
    month: 	1 * 60 * 60 * 24 * 30,
    year: 	1 * 60 * 60 * 24 * 30 * 12
  }
  diff = t_new - t_old
  if ( diff < t.minute ) {
    return {
      since: diff,
      type: "second",
    }
  }
  else if ( diff >= t.minute && diff < t.hour ) {
    return {
      since: Math.floor(diff / t.minute),
      type: "minute",
    }
  }
  else if ( diff >= t.hour && diff < t.day ) {
    return {
      since: Math.floor(diff / t.hour),
      type: "hour"
    }
  }
  else if ( diff >= t.day && diff < t.week ) {
    return {
      since: Math.floor(diff / t.day),
      type: "day"
    }
  }
  else if ( diff >= t.week && diff < t.month ) {
    return {
      since: Math.floor(diff / t.week),
      type: "week"
    }
  }
  else if ( diff >= t.month && diff < t.year ) {
    return {
      since: Math.floor(diff / t.month),
      type: "month"
    }
  }
  else if ( diff >= t.year ) {
    return {
      since: Math.floor(diff / t.year),
      type: "year"
    }
  }
}