diff --git a/dav_events/workflow.py b/dav_events/workflow.py
index c35272c..ff4bc10 100644
--- a/dav_events/workflow.py
+++ b/dav_events/workflow.py
@@ -228,7 +228,7 @@ class BasicWorkflow(object):
                 return_code = 'already-realized'
                 message = u'Event was already realized.'
         elif code.startswith('realize'):
-            if event.first_day <= today:
+            if event.first_day > today:
                 valid = False
                 return_code = 'not-started'
                 message = u'Event has not begun.'