erSetter("date", dateInput, [
     [0, "1970-01-01"],
     [1575936000000, "2019-12-10"],
     [1456704000000, "2016-02-29"] // Leap year
   ]);

   const monthInput = document.getElementById("input_month");
   testValueAsNumberGetter("month", monthInput, [
     ["", NaN],
     ["0000-12", NaN],
     ["2019-00", NaN],
     ["2019-12", 599],
     ["1969-12", -1],
   ]);
   testValueAsNumberSetter("month", monthInput, [
     [599, "2019-12"],
     [-1, "1969-12"],
   ]);

   const weekInput = document.getElem