fixed bug to show date only mode of date time string.

src/database/item-type/lib/field/DateTime.tsx

@@ -12,10 +12,10 @@ const DateTime = (props: Props) => {
     const { date, onlyDate } = props;
     const d = moment(new Date(date * 1000));
     let format = 'MMM D, Y';
-    if (typeof onlyDate !== 'undefined' || onlyDate) {
+    if (typeof onlyDate === 'undefined' || !onlyDate) {
         format += ' HH:mm:ss';
     }
     return <span>{d.format(format)}</span>;
 }
 
-export default DateTime;
+export default DateTime;