1) Admin: Estimated Date
2) Admin: actual Date
3) Project Home: Custom dates that can be added to project home
3) Prime Contract: Start Date/Substantial Completion Dates
4) Schedule tool: Dates from your P6/Project schedule

There are too many project start/stop dates in Procore and they are all disconnected/not integrated. It's difficult for users to know which field(s) they have to enter in and update.

Please improve this Procore! :)