Also, FYI, depending on your database nomenclature, it may be better to create a synonym to this function instead of using a 3 part object name [db_name].[schema_name].[function_name]

That way your queries can always reference the same name (the synonym) regardless of where the function actually lives.
https://docs.microsoft.com/en-us/sql/relational-databases/synonyms/synonyms-database-engine