How to use the effective as-of date filter in Assigned Journeys quick action?

Summary:

Effective as-of date filter in Assigned Journeys

Content (please ensure you mask any confidential information):

I want to know the purpose of the "Effective as-of Date" filter in Assigned Journeys.

Is it the hire date of the employee or the date of the journey allocation?

I tried to select a date and I didn't get any results whatever date I chose.

Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):