diff --git a/CHANGELOG.md b/CHANGELOG.md
index efb4360..fb77ac9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ and I do try to adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.h
 * `interactive set-task-attribs` (also run by `interactive manage-tasks`): a task marked `completed!` at one prompt was asked about again at the next one, and answering `completed!` there crashed on the already-completed task.  Regression in v1.2.0.
 * `list-categories` and timewarrior time tracking crashed on a task with more than one CATEGORIES line.  https://github.com/pycalendar/plann/issues/71
 * `{CATEGORIES}` in a `list --template` printed the internal `vCategory([...])` representation instead of a comma-separated list.
+* `edit --set-dtstart X --set-due Y` did not end up with DTSTART at X: moving DUE kept the duration and shifted the DTSTART that had just been set.
 
 ## v1.2.0 - 2026-09-16
 
diff --git a/plann/commands.py b/plann/commands.py
index acf88f0..0b58fc7 100644
--- a/plann/commands.py
+++ b/plann/commands.py
@@ -310,7 +310,8 @@ def _edit(ctx, cancel=None, interactive_ical=False, interactive_relations=False,
         comp = obj.icalendar_component
         if kwargs.get('pdb'):
             _pdb_edit(obj)
-        for arg in ctx.obj['set_args']:
+        ## DTSTART last: setting DUE/DTEND moves DTSTART along with it
+        for arg in sorted(ctx.obj['set_args'], key=lambda a: a.lower() == 'dtstart'):
             _set_something(obj, arg, ctx.obj['set_args'][arg])
         for canonical, tokens in add_args:
             _add_comma_list(obj, canonical, tokens)
diff --git a/plann/lib.py b/plann/lib.py
index e78ca50..4db1baf 100644
--- a/plann/lib.py
+++ b/plann/lib.py
@@ -555,6 +555,9 @@ def _complete(obj, handle_rrule=True, rrule_mode='safe', err_callback=print, cac
     for child in _relships_by_type(obj, 'CHILD', cache=cache).get('CHILD', []):
         if str(child.icalendar_component['UID']) in _seen:
             continue
+        if not isinstance(child, caldav.Todo):
+            ## an event or journal has nothing to complete
+            continue
         try:
             if not child.is_pending():
                 continue
@@ -615,7 +618,7 @@ def _set_something(obj, arg, value):
             obj.set_relation(reltype=arg, other=val)
     elif arg == 'duration':
         obj.set_duration(value)
-    elif arg in ('due', 'dtend'): ## TODO: dtstart!
+    elif arg in ('due', 'dtend'): ## moves DTSTART too - _edit sets DTSTART after this
         getattr(obj, f"set_{arg}")(value, move_dtstart=True, check_dependent=True)
     elif _is_comma_list_attr(arg):
         ## a list (already processed by _process_set_arg) or a raw comma string
diff --git a/tests/test_lib.py b/tests/test_lib.py
index e027777..1e8006c 100644
--- a/tests/test_lib.py
+++ b/tests/test_lib.py
@@ -657,3 +657,29 @@ def relships(obj, reltype_wanted=None, cache=None):
     assert odd.icalendar_component['STATUS'] == 'WAITING'
     assert child.icalendar_component['STATUS'] == 'NEEDS-ACTION'
     assert warnings == ["Not completing 'task odd': STATUS is WAITING"]
+
+def test_complete_skips_event_child():
+    """A task may have an event (or journal) as a child; it has no
+    completion state and is left alone instead of crashing"""
+    from caldav import Event
+    parent = _todo_with_uid('parent')
+    event = Event(data="""BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Example Corp.//CalDAV Client//EN
+BEGIN:VEVENT
+UID:event-child
+DTSTAMP:20200516T060000Z
+DTSTART:20200516T080000Z
+DTEND:20200516T081000Z
+SUMMARY:an event
+END:VEVENT
+END:VCALENDAR
+""")
+    def relships(obj, reltype_wanted=None, cache=None):
+        return {'CHILD': [event] if obj is parent else []}
+    warnings = []
+    with patch('plann.lib._relships_by_type', side_effect=relships), \
+         patch.object(Todo, 'save'), patch.object(Todo, 'load'):
+        _complete(parent, err_callback=warnings.append)
+    assert parent.icalendar_component['STATUS'] == 'COMPLETED'
+    assert warnings == []
diff --git a/tests/test_plann_cli.py b/tests/test_plann_cli.py
index 981724b..928cb1f 100644
--- a/tests/test_plann_cli.py
+++ b/tests/test_plann_cli.py
@@ -569,3 +569,20 @@ def test_mass_interactive_edit_works_on_tasks_fetched_after_editing():
     assert len(saved) == 1
     assert saved[0] is not task
     assert saved[0].icalendar_component['PRIORITY'] == 3
+
+
+def test_edit_sets_both_dtstart_and_due():
+    """`edit --set-dtstart X --set-due Y` ends up with exactly X and Y, in
+    whatever order the options come: moving DUE used to shift the DTSTART
+    that had just been set by the old duration"""
+    dtstart = '2025-01-10 10:00:00'
+    due = '2025-01-10 12:00:00'
+    for kwargs in ({'set_dtstart': dtstart, 'set_due': due}, {'set_due': due, 'set_dtstart': dtstart}):
+        obj = _make_todo('t', dtstart=True, due=True)
+        ctx = _FakeCtx()
+        ctx.obj['objs'] = [obj]
+        with patch.object(Todo, 'save'):
+            commands_mod._edit(ctx, **kwargs)
+        comp = obj.icalendar_component
+        assert comp['DTSTART'].dt == datetime(2025, 1, 10, 10).astimezone()
+        assert comp['DUE'].dt == datetime(2025, 1, 10, 12).astimezone()