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diff --git a/‎ietf/bin/fix-ambiguous-timestamps‎
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diff --git a/‎ietf/utils/management/commands/fix_ambiguous_timestamps.py‎
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+# Copyright The IETF Trust 2014-2019, All Rights Reserved
+# -*- coding: utf-8 -*-
+from __future__ import absolute_import, print_function, unicode_literals
+
+import datetime
+import pytz
+import sys
+
+from django.apps import apps
+from django.conf import settings
+from django.contrib.contenttypes.models import ContentType
+from django.core.management.base import BaseCommand
+from django.db import models
+
+import debug                            # pyflakes:ignore
+
+from ietf.person.models import Person
+from ietf.doc.models import DocEvent
+
+# ----------------------------------------------------------------------
+
+by = Person.objects.get(name='(System)')
+tz = pytz.timezone(settings.TIME_ZONE)
+
+class Command(BaseCommand):
+
+    def note(self, msg):
+        if not self.quiet:
+            sys.stderr.write('%s\n' % msg)
+
+    def fixup(self, model, field, start, stop):
+        lookup = {
+            '%s__gt'%field: start,
+            '%s__lt'%field: stop,
+            }
+        app_label = model._meta.app_label
+        self.note("%s.%s.%s:" % (app_label, model.__name__, field))
+        for d in model.objects.filter(**lookup).order_by('-%s'%field):
+            orig = getattr(d, field)
+            try:
+                tz.localize(orig, is_dst=None)
+            except pytz.AmbiguousTimeError as e:
+                new = orig-datetime.timedelta(minutes=60)
+                setattr(d, field, new)
+                desc = "  %s: changed ambiguous time:  %s --> %s" % (d.pk, orig, new)
+                self.note(desc)
+                if app_label == 'doc' and model.__name__ == 'Document':
+                    e = DocEvent(type='added_comment', doc=d, rev=d.rev, by=by, desc=desc)
+                    e.save()
+                    d.save_with_history([e])
+                else:
+                    d.save()
+
+    def handle(self, *app_labels, **options):
+        self.verbosity = options['verbosity']
+        self.quiet = self.verbosity < 1
+        stop = datetime.datetime.now()
+        start = stop - datetime.timedelta(days=14)
+
+        for name, appconf in apps.app_configs.items():
+            for model in appconf.get_models():
+                for field in model._meta.fields:
+                    if isinstance(field, models.DateTimeField):
+                        self.fixup(model, field.name, start, stop)
+