diff --git a/lib/xos-genx/xosgenx/jinja2_extensions/base.py b/lib/xos-genx/xosgenx/jinja2_extensions/base.py
index 431de3f..93f4581 100644
--- a/lib/xos-genx/xosgenx/jinja2_extensions/base.py
+++ b/lib/xos-genx/xosgenx/jinja2_extensions/base.py
@@ -82,7 +82,7 @@
 def xproto_api_type(field):
     try:
         if (unquote(field['options']['content_type'])=='date'):
-            return 'float'
+            return 'double'
     except KeyError:
         pass