Since ecmascript 5, Date.now() is the standard way of doing this. Generally speaking, I'd prefer to do that (with shims for older browsers) than do the equival

Since ecmascript 5, Date.now() is the standard way of doing this. Generally speaking, I'd prefer to do that (with shims for older browsers) than do the equivalent of creating a new Date object and calling .valueOf on it (which is what +new Date does).