diff --git a/wagtail/admin/widgets/button.py b/wagtail/admin/widgets/button.py
index db29674aa5..73fa3ea3cc 100644
--- a/wagtail/admin/widgets/button.py
+++ b/wagtail/admin/widgets/button.py
@@ -73,11 +73,12 @@ class BaseDropdownMenuButton(Button):
 class ButtonWithDropdownFromHook(BaseDropdownMenuButton):
     template_name = 'wagtailadmin/pages/listing/_button_with_dropdown.html'
 
-    def __init__(self, label, hook_name, page, page_perms, is_parent, **kwargs):
+    def __init__(self, label, hook_name, page, page_perms, is_parent, next_url=None, **kwargs):
         self.hook_name = hook_name
         self.page = page
         self.page_perms = page_perms
         self.is_parent = is_parent
+        self.next_url = next_url
 
         super().__init__(label, **kwargs)
 
diff --git a/wagtail/admin/widgets/datetime.py b/wagtail/admin/widgets/datetime.py
index 8888b0ab25..1cce0638b2 100644
--- a/wagtail/admin/widgets/datetime.py
+++ b/wagtail/admin/widgets/datetime.py
@@ -11,13 +11,14 @@ from wagtail.admin.staticfiles import versioned_static
 
 DEFAULT_DATE_FORMAT = '%Y-%m-%d'
 DEFAULT_DATETIME_FORMAT = '%Y-%m-%d %H:%M'
+DEFAULT_TIME_FORMAT = '%H:%M'
 
 
 class AdminDateInput(widgets.DateInput):
     template_name = 'wagtailadmin/widgets/date_input.html'
 
     def __init__(self, attrs=None, format=None):
-        default_attrs = {'autocomplete': 'new-date'}
+        default_attrs = {'autocomplete': 'off'}
         fmt = format
         if attrs:
             default_attrs.update(attrs)
@@ -47,11 +48,26 @@ class AdminDateInput(widgets.DateInput):
 class AdminTimeInput(widgets.TimeInput):
     template_name = 'wagtailadmin/widgets/time_input.html'
 
-    def __init__(self, attrs=None, format='%H:%M'):
-        default_attrs = {'autocomplete': 'new-time'}
+    def __init__(self, attrs=None, format=None):
+        default_attrs = {'autocomplete': 'off'}
         if attrs:
             default_attrs.update(attrs)
-        super().__init__(attrs=default_attrs, format=format)
+        fmt = format
+        if fmt is None:
+            fmt = getattr(settings, 'WAGTAIL_TIME_FORMAT', DEFAULT_TIME_FORMAT)
+        self.js_format = to_datetimepicker_format(fmt)
+        super().__init__(attrs=default_attrs, format=fmt)
+
+    def get_context(self, name, value, attrs):
+        context = super().get_context(name, value, attrs)
+
+        config = {
+            'format': self.js_format,
+            'formatTime': self.js_format
+        }
+        context['widget']['config_json'] = json.dumps(config)
+
+        return context
 
     @property
     def media(self):
@@ -63,14 +79,18 @@ class AdminTimeInput(widgets.TimeInput):
 class AdminDateTimeInput(widgets.DateTimeInput):
     template_name = 'wagtailadmin/widgets/datetime_input.html'
 
-    def __init__(self, attrs=None, format=None):
-        default_attrs = {'autocomplete': 'new-date-time'}
+    def __init__(self, attrs=None, format=None, time_format=None):
+        default_attrs = {'autocomplete': 'off'}
         fmt = format
         if attrs:
             default_attrs.update(attrs)
         if fmt is None:
             fmt = getattr(settings, 'WAGTAIL_DATETIME_FORMAT', DEFAULT_DATETIME_FORMAT)
+        time_fmt = time_format
+        if time_fmt is None:
+            time_fmt = getattr(settings, 'WAGTAIL_TIME_FORMAT', DEFAULT_TIME_FORMAT)
         self.js_format = to_datetimepicker_format(fmt)
+        self.js_time_format = to_datetimepicker_format(time_fmt)
         super().__init__(attrs=default_attrs, format=fmt)
 
     def get_context(self, name, value, attrs):
@@ -79,6 +99,7 @@ class AdminDateTimeInput(widgets.DateTimeInput):
         config = {
             'dayOfWeekStart': get_format('FIRST_DAY_OF_WEEK'),
             'format': self.js_format,
+            'formatTime': self.js_time_format
         }
         context['widget']['config_json'] = json.dumps(config)