Editing task times no longer tries to be clever with actual dates because you know what you're doing.

src/ifcopenshell-python/ifcopenshell/api/sequence/edit_task_time.py

@@ -38,11 +38,6 @@ class Usecase:
             and "ScheduleFinish" in self.settings["attributes"].keys()
         ):
             del self.settings["attributes"]["ScheduleFinish"]
-        if (
-            self.settings["attributes"].get("ActualDuration", None)
-            and "ActualFinish" in self.settings["attributes"].keys()
-        ):
-            del self.settings["attributes"]["ActualFinish"]
 
         duration_type = self.settings["attributes"].get("DurationType", self.settings["task_time"].DurationType)
         if "ScheduleFinish" in self.settings["attributes"]:

src/ifcopenshell-python/test/api/sequence/test_edit_task_time.py

@@ -0,0 +1,68 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import test.bootstrap
+import ifcopenshell.api
+
+
+class TestEditTaskTime(test.bootstrap.IFC4):
+    def test_editing_all_attributes(self):
+        task_time = ifcopenshell.api.run("sequence.add_task_time", self.file, task=self.file.createIfcTask())
+        ifcopenshell.api.run("sequence.edit_task_time", self.file, task_time=task_time, attributes={
+            "Name": "Name",
+            "DataOrigin": "NOTDEFINED",
+            "UserDefinedDataOrigin": "UserDefinedDataOrigin",
+            "DurationType": "ELAPSEDTIME",
+            "ScheduleDuration": "P1D",
+            "ScheduleStart": "2000-01-01T00:00:00",
+            "ScheduleFinish": "2000-01-02T00:00:00",
+            "EarlyStart": "2000-01-01T00:00:00",
+            "EarlyFinish": "2000-01-02T00:00:00",
+            "LateStart": "2000-01-01T00:00:00",
+            "LateFinish": "2000-01-02T00:00:00",
+            "FreeFloat": "P0D",
+            "TotalFloat": "P0D",
+            "IsCritical": True,
+            "StatusTime": "2000-01-01T00:00:00",
+            "ActualDuration": "P1D",
+            "ActualStart": "2000-01-01T00:00:00",
+            "ActualFinish": "2000-01-02T00:00:00",
+            "RemainingTime": "P1D",
+            "Completion": 0.5,
+
+        })
+        assert task_time.Name == "Name"
+        assert task_time.DataOrigin == "NOTDEFINED"
+        assert task_time.UserDefinedDataOrigin == "UserDefinedDataOrigin"
+        assert task_time.DurationType == "ELAPSEDTIME"
+        assert task_time.ScheduleDuration == "P1D"
+        assert task_time.ScheduleStart == "2000-01-01T00:00:00"
+        assert task_time.ScheduleFinish == "2000-01-02T00:00:00"
+        assert task_time.EarlyStart == "2000-01-01T00:00:00"
+        assert task_time.EarlyFinish == "2000-01-02T00:00:00"
+        assert task_time.LateStart == "2000-01-01T00:00:00"
+        assert task_time.LateFinish == "2000-01-02T00:00:00"
+        assert task_time.FreeFloat == "P0D"
+        assert task_time.TotalFloat == "P0D"
+        assert task_time.IsCritical == True
+        assert task_time.StatusTime == "2000-01-01T00:00:00"
+        assert task_time.ActualDuration == "P1D"
+        assert task_time.ActualStart == "2000-01-01T00:00:00"
+        assert task_time.ActualFinish == "2000-01-02T00:00:00"
+        assert task_time.RemainingTime == "P1D"
+        assert task_time.Completion == 0.5