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Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

	//addEventListener polyfill 1.0 / Eirik Backer / MIT Licence
	(function(win, doc){
	if(win.addEventListener)return; //No need to polyfill

	function docHijack(p){var old = doc[p];doc[p] = function(v){return addListen(old(v))}}
	function addEvent(on, fn, self){
	return (self = this).attachEvent('on' + on, function(e){
	var e = e \|\| win.event;
	e.preventDefault = e.preventDefault \|\| function(){e.returnValue = false}
	e.stopPropagation = e.stopPropagation \|\| function(){e.cancelBubble = true}