diff --git a/tconnectsync/sync/tandemsource/autoupdate.py b/tconnectsync/sync/tandemsource/autoupdate.py
index 06c32d2..36aec7a 100644
--- a/tconnectsync/sync/tandemsource/autoupdate.py
+++ b/tconnectsync/sync/tandemsource/autoupdate.py
@@ -40,6 +40,9 @@ class TandemSourceAutoupdate:
             logger.debug("autoupdate loop")
             now = time.time()
 
+            time_end = datetime.datetime.now()
+            time_start = time_end - datetime.timedelta(days=1)
+
             tconnectDevice = ChooseDevice(self.secret, tconnect).choose()
 
             event_seqnum = None
@@ -50,7 +53,7 @@ class TandemSourceAutoupdate:
                 if pretend:
                     logger.info('Would update now if not in pretend mode')
                 else:
-                    added, event_seqnum = ProcessTimeRange(tconnect, nightscout, tconnectDevice, pretend, self.secret, features=features).process(None, None)
+                    added, event_seqnum = ProcessTimeRange(tconnect, nightscout, tconnectDevice, pretend, self.secret, features=features).process(time_start, time_end)
                     logger.info('Added %d items from ProcessTimeRange' % added)
                     self.last_successful_process_time_range = now