I am not using any function. simple activity I am getting results like start date as   20170718T000116.000 ,  End Date as 20170718T010817.000 , in the 2nd step I am setting these properties in property set to dateTime parameters like param.StartDate = "20170718T000116.000" and Param.Enddate="20170718T010817.000 " In the tracer I could see as below which is different vaule. 

as per input value coming from database Start date should be "20170718T040116.000 GMT"  but it is adding on more hour & giving result as "20170718T050116.000 GMT" 

I have also tried using the below Java code to see how EST to GMT conversion happening it is also giving "20170718T050116.000 GMT" 

try{

  java.text.DateFormat gmtFormat = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

  java.util.TimeZone gmtTime = java.util.TimeZone.getTimeZone("GMT");

  gmtFormat.setTimeZone(gmtTime);

  java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

  sdf.setTimeZone(java.util.TimeZone.getTimeZone("EST"));

         oLog.infoForced(gmtFormat.format(sdf.parse("2017-07-18 00:01:16")));

        } catch (Exception e) {

          e.printStackTrace();

        }