fixed module datetime inaccesible

da/tools/pipeline.py

@@ -123,7 +123,7 @@ def JobInput(DaCycle, StateVector):
         # Fill each week from n=1 to n=nlag with a new ensemble
 
         for n in range(0,nlag):
-            date = DaCycle['time.start']+timedelta(days = (n+0.5)* int(DaCycle['time.cycle']))
+            date = DaCycle['time.start']+datetime.timedelta(days = (n+0.5)* int(DaCycle['time.cycle']))
             cov   = StateVector.GetCovariance(DaCycle.DaSystem,date)
             dummy = StateVector.MakeNewEnsemble(n+1,cov)