What is the target submission date when promoting app or significant update on the App Store?

When promoting my app or a significant update at https://developer.apple.com/contact/app-store/promote I have to fill out a Target Submission Date and a Target Release Date. The release date is when I want the app or update to be released to the public on the App Store, but what is the submission date? Can the submission date in relation to the release date influence the likelihood of my app or update being considered for a promotion? Should the interval between the submission and release date be as large as possible?

What is the target submission date when promoting app or significant update on the App Store?
 
 
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