Can I delete a date-effective object?

In most cases, yes. If the Delete icon appears in the search results table when you search for the object, then you can delete it. Deletion purges all of the object's physical records and isn't reversible.

After deletion, the object's history is no longer available.

Alternatively, enter an effective end date for the object or change its status to make it unavailable to transactions. With these approaches, the object's history remains available.