UPDATED a newer version (2.1.20) is now available to fix synchronization issue for employeeLeaveDateTime (see https://t.co/PQqgAu2m3X)
Back in July 2021, Microsoft has introduce a new attribute (employeeHireDate) to help manage users’ lifecycle (see https://learn.microsoft.com/en-us/graph/api/resources/identitygovernance-lifecycleworkflows-overview?view=graph-rest-beta).
Well, the new version of Azure AD Connect (2.1.19 – available for download here https://www.microsoft.com/download/details.aspx?id=47594) is now adding the counterpart – employeeLeaveDateTime.
As these attributes do not exist in Active Directory, you will have to identity an attribute (possibly one of the extensionAttribute) to store the corresponding information.
Then you will have to create custom sync rules for these attributes; all details (including formatting information) are available here https://learn.microsoft.com/en-us/azure/active-directory/governance/how-to-lifecycle-workflow-sync-attributes