Does Polaris mall really not open till 12 PM on sundays? I feel like I have been there earlier than that before.

The doors open 2 hours before the stores open so on Sundays, the doors open at 10am.

Perhaps you were there during the Christmas season, the hours change during that time.

Correct

Yes they open at 12and close at 6

Stores open at noon doors open at 10am. The mall is open until 6 PM.