DateTime property time zone issue

When I use DateTime type property to start date or date / time, found it's stored in clipboard as GMT time, e.g. user input date 20230805, then it's stored as  20230804 16:00 GMT.  (we are in GMT+8 time zone)  so it equal to local time 20230805 00:00.

Later if we want to get day of this date, we use function like @date, then we get 4 instead of 5.

Any solution for this? Thanks.