diff --git a/coordinator/ProcessorEpidemiology.py b/coordinator/ProcessorEpidemiology.py
index ceb85afeb318cf7b7b2a6bcc45d97eb60fc196cd..52b00073a37c90343512e6a5a1d8cc64544a3b3e 100644
--- a/coordinator/ProcessorEpidemiology.py
+++ b/coordinator/ProcessorEpidemiology.py
@@ -73,7 +73,7 @@ class ProcessorEpidemiology(Processor):
         # if more than 999 days
         if len(str(span_days[0]))>3:
             # assume it is a date string
-            start_date = datetime.datetime.strptime(self.span_days[0]+'0300','%Y%m%d%H%M')
+            start_date = datetime.datetime.strptime(span_days[0]+'0300','%Y%m%d%H%M')
         else:
             date_shift0 = datetime.timedelta(days=span_days[0])