/** * Returns the millisecond portion of a date as an integer between 0 and 999. * * The argument can be any expression as long as it resolves to a date. * * @see http://docs.mongodb.org/manual/reference/operator/aggregation/millisecond/ * @see Expr::millisecond * @param mixed|Expr $expression * @return self */ public function millisecond($expression) { $this->expr->millisecond($expression); return $this; }