diff --git a/superset/utils.py b/superset/utils.py
index c0c0740bd9..d40e657dc7 100644
--- a/superset/utils.py
+++ b/superset/utils.py
@@ -946,15 +946,6 @@ def get_since_until(form_data):
     return since, until
 
 
-def since_until_to_time_range(form_data):
-    if 'time_range' in form_data:
-        return
-
-    since = form_data.get('since', '')
-    until = form_data.get('until', 'now')
-    form_data['time_range'] = ' : '.join((since, until))
-
-
 def convert_legacy_filters_into_adhoc(fd):
     mapping = {'having': 'having_filters', 'where': 'filters'}
 
diff --git a/superset/viz.py b/superset/viz.py
index 7ba8645bbc..c9eea34ca2 100644
--- a/superset/viz.py
+++ b/superset/viz.py
@@ -67,8 +67,6 @@ class BaseViz(object):
         if not datasource:
             raise Exception(_('Viz is missing a datasource'))
 
-        utils.since_until_to_time_range(form_data)
-
         self.datasource = datasource
         self.request = request
         self.viz_type = form_data.get('viz_type')