entById("input_week");
   testValueAsNumberGetter("week", weekInput, [
     ["", NaN],
     ["0000-W50", NaN],
     ["2019-W00", NaN],
     ["2019-W60", NaN],
     ["2019-W50", 1575849600000],
     ["1969-W20", -20217600000],
   ]);
   testValueAsNumberSetter("week", weekInput, [
     [0, "1970-W01"],
     [1575849600000, "2019-W50"],
     [-20217600000, "1969-W20"],
   ]);

   const timeInput = document.getElementById("input_time");
   testValueAsNumberGetter("time", timeInput, [
     ["", NaN],
     ["24: