Index: wflow-py/wflow/pcrglobwb/ncConverter.py
===================================================================
diff -u -rf33154035afcaa101c5a30594b9c86a4fe9f61ef -r90a4ee3dd8724fb9dfe52fa5b7364aca4a4bd36a
--- wflow-py/wflow/pcrglobwb/ncConverter.py	(.../ncConverter.py)	(revision f33154035afcaa101c5a30594b9c86a4fe9f61ef)
+++ wflow-py/wflow/pcrglobwb/ncConverter.py	(.../ncConverter.py)	(revision 90a4ee3dd8724fb9dfe52fa5b7364aca4a4bd36a)
@@ -30,6 +30,7 @@
 import glob
 import subprocess
 import netCDF4 as nc
+import cftime
 import numpy as np
 import pcraster as pcr
 from . import virtualOS as vos
@@ -213,7 +214,7 @@
         date_time = rootgrp.variables["time"]
         if posCnt == None:
             posCnt = len(date_time)
-        date_time[posCnt] = nc.date2num(timeStamp, date_time.units, date_time.calendar)
+        date_time[posCnt] = cftime.date2num(timeStamp, date_time.units, date_time.calendar)
 
         # flip variable if necessary (to follow cf_convention)
         if self.netcdf_y_orientation_follow_cf_convention:
@@ -236,7 +237,7 @@
 
         for shortVarName in shortVarNameList:
 
-            date_time[posCnt] = nc.date2num(
+            date_time[posCnt] = cftime.date2num(
                 timeStamp, date_time.units, date_time.calendar
             )
             varField = varFieldList[shortVarName]