diff --git a/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_work_time.py b/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_work_time.py
index 2ddf9a238a..4938a35504 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_work_time.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_work_time.py
@@ -57,4 +57,6 @@ class Usecase:
         for name, value in self.settings["attributes"].items():
             if value and name in ["Start", "Finish"]:
                 value = ifcopenshell.util.date.datetime2ifc(value, "IfcDate")
+                if self.file.schema == "IFC4X3":
+                    name += "Date"
             setattr(self.settings["work_time"], name, value)