Start date in Petitioner section for Visa appointment - H1B Start Date Approval notice

Hi,I am trying to complete Visa appointment form, In my I-797B form Start Date is mentioned as 1-Oct-2019 ,while in DS-160 form I mentioned 30-Nov-2019, as Intended date of arrival in US ,as the date 1-Oct-2019 is already passed.Can someone help me in filling up Start date in Petitioner section for Visa appointment form

You should be fine to put in the approximate date of your arrival based on your convenience, it has nothing to with the date on your approval notice. You can pick any date based on when you plan to fly to US, if you get visa.