Timestamp to a plain words description of elapsed delta (great for Twitter timestamps)

gistfile1.js

// Adapted from jQuery TimeAgo plugin:
//    https://github.com/rmm5t/jquery-timeago/blob/master/jquery.timeago.js
//    Update, check out performance: http://jsperf.com/twitter-relative-time-parsing


function timetowords(timestamp) {
	var words = {
			"seconds": "less than a minute",
			"minute": "about a minute",
			"minutes": "%d minutes",
			"hour": "about an hour",
			"hours": "about %d hours",
			"day": "a day",
			"days": "%d days",
			"month": "about a month",
			"months": "%d months",
			"year": "about a year",
			"years": "%d years"
		  },
	 deltaMilliseconds = (new Date().getTime() - timestamp),
	 seconds = deltaMilliseconds / 1000,
	 minutes = seconds / 60,
	 hours = minutes / 60,
	 days = hours / 24,
	 years = days / 365;

	return seconds < 45 && words.seconds.replace(/%d/i,Math.round(seconds)) ||
	 seconds < 90 && words.minute.replace(/%d/i, 1) ||
	 minutes < 45 && words.minutes.replace(/%d/i, Math.round(minutes)) ||
	 minutes < 90 && words.hour.replace(/%d/i, 1) ||
	 hours < 24 && words.hours.replace(/%d/i, Math.round(hours)) ||
	 hours < 48 && words.day.replace(/%d/i, 1) ||
	 days < 30 && words.days.replace(/%d/i, Math.floor(days)) ||
	 days < 60 && words.month.replace(/%d/i, 1) ||
	 days < 365 && words.months.replace(/%d/i, Math.floor(days / 30)) ||
	 years < 2 && words.year.replace(/%d/i, 1) ||
	 words.years.replace(/%d/i, Math.floor(years));
}