diff --git a/src/plugins/tool/Check.py b/src/plugins/tool/Check.py
index a8a15e716..218803fae 100644
--- a/src/plugins/tool/Check.py
+++ b/src/plugins/tool/Check.py
@@ -170,7 +170,6 @@ class Check(tool.BatchTool):
         self.db.disable_signals()
         checker = CheckIntegrity(dbstate, uistate, trans)
         checker.fix_encoding()
-        checker.check_dates()
         checker.cleanup_missing_photos(cli)
         checker.cleanup_deleted_name_formats()
             
@@ -845,157 +844,6 @@ class CheckIntegrity(object):
                     self.db.commit_person(person, self.trans)
                     self.invalid_person_references.append(key)
 
-    def check_dates(self):
-        """
-        Fix issues in 3.1.0 upgrade: missed some dates on associated people
-        source dates.
-        """
-        plist = self.db.get_person_handles()
-        self.progress.set_pass(_('Checking people for proper date formats'),
-                               len(plist))
-        # First, decode all of a person:
-        for handle in plist:
-            need_to_fix = False
-            person = self.db.person_map[handle]
-            (phandle,            #  0
-             gramps_id,          #  1
-             gender,             #  2
-             primary_name,       #  3
-             alternate_names,    #  4
-             death_ref_index,    #  5
-             birth_ref_index,    #  6
-             event_ref_list,     #  7
-             family_list,        #  8
-             parent_family_list, #  9
-             media_list,         # 10
-             address_list,       # 11
-             attribute_list,     # 12
-             urls,               # 13
-             lds_ord_list,       # 14
-             psource_list,       # 15
-             pnote_list,         # 16
-             change,             # 17
-             marker,             # 18
-             pprivate,           # 19
-             person_ref_list,    # 20
-             ) = person
-            # Take apart person reference list:
-            new_person_ref_list = []
-            for person_ref in person_ref_list:
-                (private, source_list, note_list, pref, rel) = person_ref
-                new_source_list = []
-                # Check dates to see if correct format:
-                for source in source_list:
-                    (date, private, note_list, confidence, sref, page) = source
-                    if date is None:
-                        new_date = None
-                    else:
-                        if len(date) == 7:
-                            # This is correct:
-                            (calendar, modifier, quality, dateval, text, sortval,
-                             newyear) = date
-                        elif len(date) == 6:
-                            # This is necessary to fix 3.1.0 bug:
-                            (calendar, modifier, quality, dateval, text, sortval) = date
-                            newyear = 0
-                            need_to_fix = True
-                        else:
-                            # FIXME: What to do with an invalid date?
-                            # Make a new one?
-                            (calendar, modifier, quality, dateval, text, sortval,
-                             newyear) = gen.lib.Date().serialize()
-                            need_to_fix = True
-                        # Put date back together:
-                        new_date = (calendar, modifier, quality, dateval, text, sortval,
-                                    newyear)
-                    # Put source_list together:
-                    new_source_list.append((new_date, private, note_list, confidence, sref, page))
-                # Put new_person_ref together:
-                new_person_ref_list.append((private, new_source_list, note_list, pref, rel))
-            # Put person back together:
-            if need_to_fix:
-                new_person = (phandle,            #  0
-                              gramps_id,          #  1
-                              gender,             #  2
-                              primary_name,       #  3
-                              alternate_names,    #  4
-                              death_ref_index,    #  5
-                              birth_ref_index,    #  6
-                              event_ref_list,     #  7
-                              family_list,        #  8
-                              parent_family_list, #  9
-                              media_list,         # 10
-                              address_list,       # 11
-                              attribute_list,     # 12
-                              urls,               # 13
-                              lds_ord_list,       # 14
-                              psource_list,       # 15
-                              pnote_list,         # 16
-                              change,             # 17
-                              marker,             # 18
-                              pprivate,           # 19
-                              new_person_ref_list,    # 20
-                              )
-                p = gen.lib.Person(new_person)
-                self.db.commit_person(p, self.trans)
-                self.invalid_dates.append(handle)
-            self.progress.step()
-
-        flist = self.db.get_family_handles()
-        self.progress.set_pass(_('Checking families for proper date formats'),
-                               len(flist))
-        # First, decode all of a person:
-        for handle in flist:
-            need_to_fix = False
-            family = self.db.family_map[handle]
-            (fhandle, gramps_id, father_handle, mother_handle,
-             child_ref_list, the_type, event_ref_list, media_list,
-             attribute_list, lds_seal_list, source_list, note_list,
-             change, marker, private) = family
-
-            new_child_ref_list = []
-            for data in child_ref_list:
-                (private, source_list, note_list, ref, frel, mrel) = data
-                new_source_list = []
-                # Check dates to see if correct format:
-                for source in source_list:
-                    (date, private, note_list, confidence, sref, page) = source
-                    if date is None:
-                        new_date = None
-                    else:
-                        if len(date) == 7:
-                            # This is correct:
-                            (calendar, modifier, quality, dateval, text, sortval,
-                             newyear) = date
-                        elif len(date) == 6:
-                            # This is necessary to fix 3.1.0 bug:
-                            (calendar, modifier, quality, dateval, text, sortval) = date
-                            newyear = 0
-                            need_to_fix = True
-                        else:
-                            # FIXME: What to do with an invalid date?
-                            # Make a new one?
-                            (calendar, modifier, quality, dateval, text, sortval,
-                             newyear) = gen.lib.Date().serialize()
-                            need_to_fix = True
-                        # Put date back together:
-                        new_date = (calendar, modifier, quality, dateval, text, sortval,
-                                    newyear)
-                    # Put source_list together:
-                    new_source_list.append((new_date, private, note_list, confidence, sref, page))
-                # Put child ref list together:
-                new_child_ref_list.append((private, new_source_list, note_list, ref, frel, mrel))
-            if need_to_fix:
-                new_family = (fhandle, gramps_id, father_handle, mother_handle,
-                              new_child_ref_list, the_type, event_ref_list, media_list,
-                              attribute_list, lds_seal_list, source_list, note_list,
-                              change, marker, private)
-                f = gen.lib.Family()
-                f.unserialize(new_family)
-                self.db.commit_family(f, self.trans)
-                self.invalid_dates.append(handle)
-            self.progress.step()
-
     def check_repo_references(self):
         slist = self.db.get_source_handles()