Earning date

To my knowledge, future earnings dates are not in the scan engine database, probably because the exact date isn't definitely know far enough in advance to keep the data accurate and up to date, or if a vendor does supply it, it's too expensive.

However, you can probably predict many of them because often it will be the same day - e.g. the second Monday of the reporting month. If it isn't, that's a clue, according to this article

https://www.forbes.com/sites/simonmoore/2019/01/30/the-hidden-signal-in-delayed-earnings-announcements/#41819c685750

Unfortunately, though, the possibility that a date can be changed does mean you have to check.