niceDateInterval.js

function niceDate(d){
	var now=new Date();
	if(!d.getFullYear)d=new Date(d);
	if(d.getDate()==now.getDate()){
		if(d.getHours()==now.getHours()){
			if(d.getMinutes()==now.getMinutes()){
				return now.getSeconds()-d.getSeconds()+" seconds ago";
			}
			return now.getMinutes()-d.getMinutes()+" minutes ago";
		}
		return now.getHours()-d.getHours()+" hours ago";
	}
	var daydiff=~~((now.getTime()-d.getTime())/1000/3600/24);
	if(daydiff<7){
		return ["monday","tuesday","wednesday","thursday","friday","saturday","sunday"][(d.getDay()+6)%7];
	}
	if(daydiff<31){
		return daydiff+" days ago";
	}
	if(daydiff<365){
		return ~~(daydiff/31)+" months ago";
	}
	return now.getFullYear()-d.getFullYear()+" years ago";
}