readable-range.js

(function(moment) {

	moment.fn.preciseDiff = function(d2) {
		return moment.preciseDiff(this, d2);
	};
	moment.preciseDiff = function(d1, d2) {
		moment.relativeTimeThreshold('s',60);
		moment.relativeTimeThreshold('m',60);
		moment.relativeTimeThreshold('h',24);
		moment.relativeTimeThreshold('d',28);
		moment.relativeTimeThreshold('M',12);

		var m1 = moment(d1), m2 = moment(d2);
		if (m1.isSame(m2)) {
			return '';
		}
		if (m1.isAfter(m2)) {
			var tmp = m1;
			m1 = m2;
			m2 = tmp;
		}

		var yDiff = m2.year() - m1.year();
		var mDiff = m2.month() - m1.month();
		var dDiff = m2.date() - m1.date();
		var hourDiff = m2.hour() - m1.hour();
		var minDiff = m2.minute() - m1.minute();
		var secDiff = m2.second() - m1.second();

		if (secDiff < 0) {
			secDiff = 60 + secDiff;
			minDiff--;
		}
		if (minDiff < 0) {
			minDiff = 60 + minDiff;
			hourDiff--;
		}
		if (hourDiff < 0) {
			hourDiff = 24 + hourDiff;
			dDiff--;
		}
		if (dDiff < 0) {
			var daysInLastFullMonth = moment(m2.year() + '-' + (m2.month() + 1), "YYYY-MM").subtract('months', 1).daysInMonth();
			if (daysInLastFullMonth < m1.date()) { // 31/01 -> 2/03
				dDiff = daysInLastFullMonth + dDiff + (m1.date() - daysInLastFullMonth);
			} else {
				dDiff = daysInLastFullMonth + dDiff;
			}
			mDiff--;
		}
		if (dDiff >= moment.relativeTimeThreshold('d')) {
			dDiff = 0;
			mDiff++;
		}

		if (mDiff < 0) {
			mDiff = 12 + mDiff;
			yDiff--;
		}

		var result = [];

		if (yDiff) {
			result.push(moment.duration(yDiff,'year').humanize());
		}
		if (mDiff) {
			result.push(moment.duration(mDiff,'month').humanize());
		}
		if (dDiff) {
			result.push(moment.duration(dDiff,'day').humanize());
		}
		if (hourDiff) {
			result.push(moment.duration(hourDiff,'hour').humanize());
		}
		if (minDiff) {
			result.push(moment.duration(minDiff,'minute').humanize());
		}
		if (secDiff) {
			result.push(moment.duration(secDiff,'second').humanize());
		}

		result = result.join(' ');
		result = result.charAt(0).toUpperCase() + result.slice(1);
		return result;
	};

}(moment));