diff --git a/Common/processing.cpp b/Common/processing.cpp
index 7cab6e6..686f3be 100644
--- a/Common/processing.cpp
+++ b/Common/processing.cpp
@@ -1,5 +1,5 @@
 /*
-*	Copyright (C) 2010 Thorsten Liebig (Thorsten.Liebig@gmx.de)
+*	Copyright (C) 2010-2015 Thorsten Liebig (Thorsten.Liebig@gmx.de)
 *
 *	This program is free software: you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
@@ -40,6 +40,8 @@ Processing::Processing(Engine_Interface_Base* eng_if)
 	m_SnapMethod = 0;
 	m_Mesh_Type = CARTESIAN_MESH;
 
+	startTS=0;
+	stopTS =UINT_MAX;
 	for (int n=0;n<3;++n)
 	{
 		start[n]=0;
@@ -77,9 +79,12 @@ void Processing::SetName(string val, int number)
 
 bool Processing::CheckTimestep()
 {
+	unsigned int ts = m_Eng_Interface->GetNumberOfTimesteps();
+	if (ts<startTS || ts>stopTS)
+		return false;
 	if (m_ProcessSteps.size()>m_PS_pos)
 	{
-		if (m_ProcessSteps.at(m_PS_pos)==m_Eng_Interface->GetNumberOfTimesteps())
+		if (m_ProcessSteps.at(m_PS_pos)==ts)
 		{
 			++m_PS_pos;
 			return true;
@@ -87,12 +92,12 @@ bool Processing::CheckTimestep()
 	}
 	if (ProcessInterval)
 	{
-		if (m_Eng_Interface->GetNumberOfTimesteps()%ProcessInterval==0) return true;
+		if (ts%ProcessInterval==0) return true;
 	}
 
 	if (m_FD_Interval)
 	{
-		if (m_Eng_Interface->GetNumberOfTimesteps()%m_FD_Interval==0) return true;
+		if (ts%m_FD_Interval==0) return true;
 	}
 	return false;
 }
@@ -101,13 +106,14 @@ int Processing::GetNextInterval() const
 {
 	if (Enabled==false) return -1;
 	int next=INT_MAX;
+	int ts = (int)m_Eng_Interface->GetNumberOfTimesteps();
 	if (m_ProcessSteps.size()>m_PS_pos)
 	{
-		next = (int)m_ProcessSteps.at(m_PS_pos)-(int)m_Eng_Interface->GetNumberOfTimesteps();
+		next = (int)m_ProcessSteps.at(m_PS_pos)-ts;
 	}
 	if (ProcessInterval!=0)
 	{
-		int next_Interval = (int)ProcessInterval - (int)m_Eng_Interface->GetNumberOfTimesteps()%ProcessInterval;
+		int next_Interval = (int)ProcessInterval - ts%ProcessInterval;
 		if (next_Interval<next)
 			next = next_Interval;
 	}
@@ -115,10 +121,11 @@ int Processing::GetNextInterval() const
 	//check for FD sample interval
 	if (m_FD_Interval!=0)
 	{
-		int next_Interval = (int)m_FD_Interval - (int)m_Eng_Interface->GetNumberOfTimesteps()%m_FD_Interval;
+		int next_Interval = (int)m_FD_Interval - ts%m_FD_Interval;
 		if (next_Interval<next)
 			next = next_Interval;
 	}
+
 	return next;
 }
 
@@ -194,6 +201,23 @@ void Processing::ShowSnappedCoords()
 		 << stop[0] << "," << stop[1] << "," << stop[2] << "]" << endl;
 }
 
+void Processing::SetProcessStartStopTime(double start, double stop)
+{
+	double dT = Op->GetTimestep();
+	startTS = 0;
+	stopTS  = UINT_MAX;
+	if (start>0)
+		startTS = floor(start/dT);
+	if (stop>0)
+		stopTS = ceil(stop/dT);
+	if (stopTS<=startTS)
+	{
+		cerr << "Processing::SetProcessStartStopTimestep: Invalid start/stop values! Disabling!" << endl;
+		startTS = 0;
+		stopTS  = UINT_MAX;
+	}
+}
+
 void Processing::OpenFile( string outfile )
 {
 	if (file.is_open())
diff --git a/Common/processing.h b/Common/processing.h
index d3cc88d..e6c37fb 100644
--- a/Common/processing.h
+++ b/Common/processing.h
@@ -1,5 +1,5 @@
 /*
-*	Copyright (C) 2010 Thorsten Liebig (Thorsten.Liebig@gmx.de)
+*	Copyright (C) 2010-2015 Thorsten Liebig (Thorsten.Liebig@gmx.de)
 *
 *	This program is free software: you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
@@ -62,6 +62,7 @@ public:
 	virtual void ShowSnappedCoords();
 
 	void SetProcessInterval(unsigned int interval) {ProcessInterval=max((unsigned int)1,interval);}
+	void SetProcessStartStopTime(double start, double stop);
 
 	void AddStep(unsigned int step);
 	void AddSteps(vector<unsigned int> steps);
@@ -151,6 +152,9 @@ protected:
 	unsigned int start[3];
 	unsigned int stop[3];
 
+	//! start/stop timestep
+	unsigned int startTS, stopTS;
+
 	//! define/store if snapped start/stop coords are inside the field domain
 	bool m_start_inside[3];
 	bool m_stop_inside[3];
diff --git a/main.cpp b/main.cpp
index 1d5408e..b1ace94 100644
--- a/main.cpp
+++ b/main.cpp
@@ -54,7 +54,7 @@ int main(int argc, char *argv[])
 
 	cout << " ---------------------------------------------------------------------- " << endl;
 	cout << " | openEMS " << bits << " -- version " GIT_VERSION << endl;
-	cout << " | (C) 2010-2013 Thorsten Liebig <thorsten.liebig@gmx.de>  GPL license" << endl;
+	cout << " | (C) 2010-2015 Thorsten Liebig <thorsten.liebig@gmx.de>  GPL license" << endl;
 	cout << " ---------------------------------------------------------------------- " << endl;
 #ifdef MPI_SUPPORT
 	cout << openEMS_FDTD_MPI::GetExtLibsInfo() << endl;
diff --git a/openems.cpp b/openems.cpp
index 4013134..b23f8a0 100644
--- a/openems.cpp
+++ b/openems.cpp
@@ -1,5 +1,5 @@
 /*
-*	Copyright (C) 2010 Thorsten Liebig (Thorsten.Liebig@gmx.de)
+*	Copyright (C) 2010-2015 Thorsten Liebig (Thorsten.Liebig@gmx.de)
 *
 *	This program is free software: you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
@@ -406,6 +406,8 @@ bool openEMS::SetupProcessing()
 						proc->SetDualMesh(true);
 					}
 					proc->SetProcessInterval(Nyquist/m_OverSampling);
+					if (pb->GetStartTime()>0 || pb->GetStopTime()>0)
+						proc->SetProcessStartStopTime(pb->GetStartTime(), pb->GetStopTime());
 					proc->AddFrequency(pb->GetFDSamples());
 					proc->GetNormalDir(pb->GetNormalDir());
 					if (l_MultiBox==false)
@@ -470,6 +472,8 @@ bool openEMS::SetupProcessing()
 					{
 						ProcField->SetEnable(Enable_Dumps);
 						ProcField->SetProcessInterval(Nyquist/m_OverSampling);
+						if (db->GetStopTime()>0 || db->GetStartTime()>0)
+							ProcField->SetProcessStartStopTime(db->GetStartTime(), db->GetStopTime());
 						if ((db->GetDumpType()==1) || (db->GetDumpType()==11))
 						{
 							ProcField->SetDualTime(true);