DS160: H1B Stamping - What is Petition start date?

Hi,

My start date is Feb 4 as per my H1 transfer approval. But i joined the company on Feb 18. In DS-160 there is a start date under present employer and for visa appointment scheduling there is a Petitioner start date.
what should be the dates for both of these? Is it my start date on approval or joining date?

Thanks

Petition start date is the validity start date on your H1B approved i797.

The employment start date is the actual date when you started working for the employer.