diff --git a/web/mailman-web/settings.py b/web/mailman-web/settings.py
index 6c2d0d0..e58e9b1 100644
--- a/web/mailman-web/settings.py
+++ b/web/mailman-web/settings.py
@@ -178,7 +178,7 @@ AUTH_PASSWORD_VALIDATORS = [
 
 LANGUAGE_CODE = 'en-us'
 
-TIME_ZONE = 'UTC'
+TIME_ZONE = os.environ.get('TZ', 'UTC')
 
 USE_I18N = True