Improved check for valid dates

src/editor/components/datevisibilityinput.tsx

@@ -8,7 +8,7 @@ type DateVisibilityInputProps = {
 
 function DateVisibilityInput({ date, onDateChange }: DateVisibilityInputProps) {
     const isDate = (date?: string): boolean => {
-        if (!date) {
+        if (!date || date.length !== 10) {
             return false;
         }
 
@@ -80,7 +80,6 @@ function DateVisibilityInput({ date, onDateChange }: DateVisibilityInputProps) {
                 onChange={(e) => updateVisibilityState(e.target.checked)}
             />
             <label htmlFor="date-checkbox">Always visible</label>
-            {editedDate}
             {!alwaysVisible && (
                 <input
                     type={"date"}