Implementation of the "since x time ago" format, it starts from second to millennium ;-)

timeDiff2.js

/*
 * timeDiff, return the difference between two times "in seconds"
 * in the format of "since x (second|minute|...)(s) ago" .
 *
 * @version		v2.0
 * @license		MIT License
 * @author		Mohammed Al Ashaal <www.alash3al.xyz>
 * @example		`console.log(timeDiff(current_unix_timestamp, old_unix_timestamp))`
 * @return		Object
 */
function timeDiff(t_new, t_old){
	var types = ["millennium", "century", "decade", "year", "month", "week", "day", "hour", "minute", "second"]
	var diff = t_new - t_old
	var res = {}
	var t = {}

	t.second 		= 	1
	t.minute 		= 	t.second * 60
	t.hour 			= 	t.minute * 60
	t.day 			= 	t.hour * 24
	t.week 			= 	t.day * 7
	t.month 		= 	t.day * 30
	t.year 			= 	t.month * 12
	t.decade		=	t.year * 10
	t.century		=	t.decade * 10
	t.millennium	=	t.century * 10

	for ( var k in types ) {
		if ( (diff / t[types[k]]) >= 1 ) {
			res = {
				type: types[k],
				since: Math.floor(diff / t[types[k]]),
			}
			break
		}
	}

	res.text = "since " + res.since + " " + res.type + "(s) ago"

	return res
}