CORD-1867 prevent synchronizer from setting updated timestamps backward

Change-Id: I275111e3cffc08f067b842ab6d4d7e253c9c52c4
diff --git a/lib/xos-genx/xosgenx/jinja2_extensions/base.py b/lib/xos-genx/xosgenx/jinja2_extensions/base.py
index 84f0a97..4982da2 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