learning initiative person criteria with or without hire date condition?

Summary

learning initiative person criteria with or without hire date condition?

Content

Hello,

I’m creating a person criteria ,of system person type employee and the legal employer requested.

Do we need the hire date filter ? meaning  : 

1. If we have the person criteria on all employees without the hire date condition -The population will contain everyday the same employees + the new hired  - will the process not enroll them again / damage their already enrollment? (or condition with hire date equal or after a date )

2. If we have a report of all employees with hire date equals to today - will the process remove the enrollment of those who are enrolled and weren’t hired today (hired before today )?