A DLL working good in my project but when i change it to windows service not working

I have a Windows Service (in C#). This program interacts with an external DLL that has a method that returns an HL7 object and i sending it a datetime parametre.when i call this medhod from this dll,I get an exception like

System.IndexOutOfRangeException: MHRS_WINDOWS.MHRS_Biz.CheckShedule_XML(DateTime startdate, DateTime enddate)

This method is working fine when i call it as a different project.but when i make it windows service, i get that exception. I have no idea about this difference.

This is why?

Is there something I can do to make sur开发者_如何学Goe the DLL call works as intended?

I would say that you are doing the DateTime parsing using the default locale, and the default locale is different in the user profile and in the system profile (used in the service).