Write a method check_opening_time which takes a Time instance as an argument, and return "Open" or "Closed" based on the hours of the store, as follows:
- On weekdays, the store is open from 9am to 12pm, and from 2pm to 6pm.
- On Saturdays, the store is open from 10am to 4pm.
- On Sundays, the store is closed.