diff --git a/components/isceobj/Orbit/Orbit.py b/components/isceobj/Orbit/Orbit.py
index a68f59c..548ade6 100644
--- a/components/isceobj/Orbit/Orbit.py
+++ b/components/isceobj/Orbit/Orbit.py
@@ -1053,12 +1053,20 @@ class Orbit(Component):
         return tguess, rng
 
 
-    def exportToC(self):
+    def exportToC(self, reference=None):
         from isceobj.Util import combinedlibmodule
         orb = []
 
+        ###Continue usage as usual if no reference is provided
+        ###This wont break the old interface but could cause 
+        ###issues at midnight crossing
+        if reference is None:
+            reference = self.minTime()
+
+        refEpoch = reference.replace(hour=0, minute=0, second=0, microsecond=0)
+
         for sv in self._stateVectors:
-            tim = DTU.seconds_since_midnight(sv.getTime())
+            tim = (sv.getTime() - refEpoch).total_seconds()
             pos = sv.getPosition()
             vel = sv.getVelocity()
 
diff --git a/components/zerodop/geo2rdr/Geo2rdr.py b/components/zerodop/geo2rdr/Geo2rdr.py
index 9dd46bd..426c27e 100755
--- a/components/zerodop/geo2rdr/Geo2rdr.py
+++ b/components/zerodop/geo2rdr/Geo2rdr.py
@@ -34,6 +34,7 @@ from isceobj import Constants as CN
 from iscesys.Component.Component import Component, Port
 from zerodop.geo2rdr import geo2rdr
 from iscesys.ImageUtil.ImageUtil import ImageUtil as IU
+from iscesys import DateTimeUtil as DTU
 from isceobj.Util import combinedlibmodule
 from isceobj.Util.Poly1D import Poly1D
 from isceobj.Util.Poly2D import Poly2D
@@ -243,7 +244,7 @@ class Geo2rdr(Component):
             azimuthOffAcc = self.azimuthOffsetImage.getImagePointer()
 
 
-        cOrbit = self.orbit.exportToC()
+        cOrbit = self.orbit.exportToC(reference=self.sensingStart)
         geo2rdr.setOrbit_Py(cOrbit)
 
         #####Output cropped DEM for first band
@@ -393,7 +394,7 @@ class Geo2rdr(Component):
         geo2rdr.setDopplerAccessor_Py(self.polyDopplerAccessor)
         geo2rdr.setPRF_Py(float(self.prf))
         geo2rdr.setRadarWavelength_Py(float(self.radarWavelength))
-        geo2rdr.setSensingStart_Py(float(self.sensingStart))
+        geo2rdr.setSensingStart_Py(DTU.seconds_since_midnight(self.sensingStart))
         geo2rdr.setLength_Py(int(self.length))
         geo2rdr.setWidth_Py(int(self.width))
         geo2rdr.setNumberRangeLooks_Py(int(self.numberRangeLooks))
@@ -424,9 +425,7 @@ class Geo2rdr(Component):
         self.radarWavelength = float(var)
 
     def setSensingStart(self,var):
-        rtime = datetime.datetime.combine(var.date(), datetime.time(0,0,0))
-        secs = (var - rtime).total_seconds()
-        self.sensingStart = float(secs)
+        self.sensingStart = var
 
     def setLength(self,var):
         self.length = int(var)
diff --git a/components/zerodop/geozero/Geozero.py b/components/zerodop/geozero/Geozero.py
index a79bd5c..cebd374 100755
--- a/components/zerodop/geozero/Geozero.py
+++ b/components/zerodop/geozero/Geozero.py
@@ -34,6 +34,7 @@ from isceobj import Constants as CN
 from iscesys.Component.Component import Component, Port
 from zerodop.geozero import geozero
 from iscesys.ImageUtil.ImageUtil import ImageUtil as IU
+from iscesys import DateTimeUtil as DTU
 from isceobj.Util import combinedlibmodule
 from isceobj.Util.Poly1D import Poly1D
 import os
@@ -221,7 +222,7 @@ class Geocode(Component):
         complexFlag = self.inputImage.dataType.upper().startswith('C')
         nBands = self.inputImage.getBands()
 
-        cOrbit = self.orbit.exportToC()
+        cOrbit = self.orbit.exportToC(reference=self.sensingStart)
         geozero.setOrbit_Py(cOrbit)
 
         #####Output cropped DEM for first band
@@ -347,7 +348,7 @@ class Geocode(Component):
         geozero.setDopplerAccessor_Py(self.polyDopplerAccessor)
         geozero.setPRF_Py(float(self.prf))
         geozero.setRadarWavelength_Py(float(self.radarWavelength))
-        geozero.setSensingStart_Py(float(self.sensingStart))
+        geozero.setSensingStart_Py(DTU.seconds_since_midnight(self.sensingStart))
         geozero.setFirstLatitude_Py(float(self.firstLatitude))
         geozero.setFirstLongitude_Py(float(self.firstLongitude))
         geozero.setDeltaLatitude_Py(float(self.deltaLatitude))
@@ -392,9 +393,7 @@ class Geocode(Component):
         self.radarWavelength = float(var)
 
     def setSensingStart(self,var):
-        rtime = datetime.datetime.combine(var.date(), datetime.time(0,0,0))
-        secs = (var - rtime).total_seconds()
-        self.sensingStart = float(secs)
+        self.sensingStart = var
 
     def setFirstLatitude(self,var):
         self.firstLatitude = float(var)
diff --git a/components/zerodop/topozero/Topozero.py b/components/zerodop/topozero/Topozero.py
index 0e6ba2b..cf0fe39 100755
--- a/components/zerodop/topozero/Topozero.py
+++ b/components/zerodop/topozero/Topozero.py
@@ -120,7 +120,7 @@ class Topo(Component):
 
         self.setState()
 
-        cOrbit = self.orbit.exportToC()
+        cOrbit = self.orbit.exportToC(reference=self.sensingStart)
         topozero.setOrbit_Py(cOrbit)
         topozero.topo_Py(self.demAccessor, self.polyDopplerAccessor, self.slantRangeAccessor)
         combinedlibmodule.freeCOrbit(cOrbit)