diff --git a/rhodecode/apps/admin/views/users.py b/rhodecode/apps/admin/views/users.py
--- a/rhodecode/apps/admin/views/users.py
+++ b/rhodecode/apps/admin/views/users.py
@@ -137,8 +137,7 @@ class AdminUsersView(BaseAppView):
                 "first_name": h.escape(user.name),
                 "last_name": h.escape(user.lastname),
                 "last_login": h.format_date(user.last_login),
-                "last_activity": h.format_date(
-                    h.time_to_datetime(user.user_data.get('last_activity', 0))),
+                "last_activity": h.format_date(user.last_activity),
                 "active": h.bool2icon(user.active),
                 "active_raw": user.active,
                 "admin": h.bool2icon(user.admin),
diff --git a/rhodecode/model/db.py b/rhodecode/model/db.py
--- a/rhodecode/model/db.py
+++ b/rhodecode/model/db.py
@@ -846,12 +846,9 @@ class User(Base, BaseModel):
 
     def update_lastactivity(self):
         """Update user lastactivity"""
-        usr = self
-        old = usr.user_data
-        old.update({'last_activity': time.time()})
-        usr.user_data = old
-        Session().add(usr)
-        log.debug('updated user %s lastactivity', usr.username)
+        self.last_activity = datetime.datetime.now()
+        Session().add(self)
+        log.debug('updated user %s lastactivity', self.username)
 
     def update_password(self, new_password):
         from rhodecode.lib.auth import get_crypt_password
diff --git a/rhodecode/templates/admin/users/user_edit_advanced.mako b/rhodecode/templates/admin/users/user_edit_advanced.mako
--- a/rhodecode/templates/admin/users/user_edit_advanced.mako
+++ b/rhodecode/templates/admin/users/user_edit_advanced.mako
@@ -6,7 +6,7 @@
     (_('Source of Record'), c.user.extern_type, '', ''),
 
     (_('Last login'), c.user.last_login or '-', '', ''),
-    (_('Last activity'), h.format_date(h.time_to_datetime(c.user.user_data.get('last_activity', 0))), '', ''),
+    (_('Last activity'), c.user.last_activity, '', ''),
 
     (_('Repositories'), len(c.user.repositories), '', [x.repo_name for x in c.user.repositories]),
     (_('Repository groups'), len(c.user.repository_groups), '', [x.group_name for x in c.user.repository_groups]),