... because it [calls](https://github.com/YoYoGames/GameMaker-HTML5/blob/c009844c7f7f2e2897858ab02baf2eb0c513872c/scripts/functions/Function_Maths.js#L583) `date.getMilliseconds()` (which returns 0-999) instead of `date.getTime()` (which returns milliseconds since the epoch)