diff --git a/beets/ui/commands/modify.py b/beets/ui/commands/modify.py
index 18ea099f58..15dbbc581c 100644
--- a/beets/ui/commands/modify.py
+++ b/beets/ui/commands/modify.py
@@ -72,14 +72,20 @@ def modify_items(lib, mods, dels, query, write, move, album, confirm, inherit):
     templates = {}
     for key, mod in mods.items():
         templates[key] = functemplate.template(mod.value)
-    for obj in objs:
+
+    def parse_mods(obj):
+        # Parse the raw assignment strings into properly typed values for the
+        # given object (e.g. dates into timestamps) and apply each mod.
         obj_mods = {}
         for key, mod in mods.items():
             parsed_value = model_cls._parse(
                 key, obj.evaluate_template(templates[key])
             )
             obj_mods[key] = mod.apply(obj, key, parsed_value)
-        if print_and_modify(obj, obj_mods, dels) and obj not in changed:
+        return obj_mods
+
+    for obj in objs:
+        if print_and_modify(obj, parse_mods(obj), dels) and obj not in changed:
             changed.append(obj)
 
     # Still something to do?
@@ -101,7 +107,7 @@ def modify_items(lib, mods, dels, query, write, move, album, confirm, inherit):
         changed = ui.input_select_objects(
             f"Really modify{extra}",
             changed,
-            lambda o: print_and_modify(o, mods, dels),
+            lambda o: print_and_modify(o, parse_mods(o), dels),
         )
 
     # Apply changes to database and files
diff --git a/docs/changelog.rst b/docs/changelog.rst
index c99f7b295d..d99b6f9901 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -64,6 +64,9 @@ Bug fixes
   longer crashes with a ``TypeError``. Missing values are now grouped together,
   ordered before present ones when sorting ascending and after them when
   descending. :bug:`3461`
+- ``modify``: Fix a crash when choosing ``select`` at the confirmation prompt
+  while modifying a non-string field such as ``added``; the per-object value is
+  now parsed before being applied. :bug:`4880`
 
 ..
     For plugin developers
diff --git a/test/ui/commands/test_modify.py b/test/ui/commands/test_modify.py
index a74f08a44a..bbd9c167de 100644
--- a/test/ui/commands/test_modify.py
+++ b/test/ui/commands/test_modify.py
@@ -111,6 +111,14 @@ def test_selective_modify(self):
         assert len(list(original_items)) == 3
         assert len(list(new_items)) == 7
 
+    def test_selective_modify_typed_field(self):
+        # Regression test for a crash when selecting individual objects to
+        # modify a non-string (here date) field: the confirmation callback
+        # used to re-apply the raw string instead of the parsed value.
+        self.modify_inp(["s", "y"], "added=2002-06-03 00:00:00")
+        item = self.lib.items().get()
+        assert item.added == pytest.approx(1023062400, abs=24 * 60 * 60)
+
     def test_modify_formatted(self):
         for i in range(3):
             self.add_item_fixture(