Based on my understanding I currently have weekly option trading symbol in following format: 5th Dec 2019 contract Nifty - NIFTY19D0512100CE BankNifty - BANKNIFTY19D0531600CE
After downloading the latest instrument file when I search through it for Jan 2020 weekly contracts they seem to be missing. For example if I search for Nifty 12100 CE 2nd Jan 20 contract - NIFTY20J0212100CE I find nothing. All it has are month end contracts ex NIFTY20JAN12100CE
Am I missing something here? Or are the trading symbols of 02 Jan 2020 weekly contract something else?