Index: wflow-py/wflow/wf_DynamicFramework.py
===================================================================
diff -u -r9c33accc4863cd353267f08290367eded8705ea0 -rc3eed6a0f362cbe559022b2d24a46abf43e91dc9
--- wflow-py/wflow/wf_DynamicFramework.py	(.../wf_DynamicFramework.py)	(revision 9c33accc4863cd353267f08290367eded8705ea0)
+++ wflow-py/wflow/wf_DynamicFramework.py	(.../wf_DynamicFramework.py)	(revision c3eed6a0f362cbe559022b2d24a46abf43e91dc9)
@@ -41,6 +41,7 @@
 from pcraster.framework import *
 from wflow_lib import *
 import time
+import calendar
 
 def log_uncaught_exceptions(ex_cls, ex, tb):
     global logging
@@ -1427,7 +1428,7 @@
       :return: current time as seconds since epoch
       """
 
-      seconds_since_epoch = time.mktime(self.datetime_firststep.utctimetuple())
+      seconds_since_epoch = calendar.timegm(self.datetime_firststep.utctimetuple())
 
       return seconds_since_epoch + (self._d_lastTimestep - self._d_firstTimestep + 1) * self._userModel().timestepsecs
 
@@ -1436,7 +1437,7 @@
       gets the start time of the model run
       :return: current time as seconds since epoch
       """
-      seconds_since_epoch = time.mktime(self.datetime_firststep.utctimetuple())
+      seconds_since_epoch = calendar.timegm(self.datetime_firststep.utctimetuple())
 
       return seconds_since_epoch
 
@@ -1450,7 +1451,8 @@
 
           
       """
-      seconds_since_epoch = time.mktime(self.currentdatetime.utctimetuple())
+      seconds_since_epoch = calendar.timegm(self.currentdatetime.utctimetuple())
+
       return seconds_since_epoch
 
   def wf_supplyEpoch(self):