c# - .Net service receive SERVICE_CONTROL_TIMECHANGE -

i'm writing windows service using vb.net , built-in system.serviceprocess.servicebase class uses onsessionchange function track when users log in , out. can determine how time each user spends on computer.

i detect when system time changes, not affect accuracy of data collected, , looks microsoft has added message purpose: service_control_timechange, of windows 7.

however, built-in servicebase class not support message, , doesn't seem extensible can add full support message. note can receive message (stripped of it's parameter) using code:

public class timemanager     public sub new()         initializecomponent()         'modify base class' field...         enabletimechange()     end sub     private sub enabletimechange()         try             dim acceptedcommands reflection.fieldinfo = me.gettype().basetype.getfield("acceptedcommands", reflection.bindingflags.nonpublic or reflection.bindingflags.instance or reflection.bindingflags.ignorecase)             if acceptedcommands isnot nothing                 dim value integer = acceptedcommands.getvalue(me)                 value = value or &h200                 acceptedcommands.setvalue(me, value)             else                 me.eventlog.writeentry("reflection not find 'acceptedcommands'!", eventlogentrytype.warning)             end if         catch ex exception             me.eventlog.writeentry(ex.tostring(), eventlogentrytype.warning)         end try     end sub     protected overrides sub oncustomcommand(command integer)         select case command             case 16 'service_control_timechange                  me.eventlog.writeentry("time changed!",  eventlogentrytype.information)          end select     end sub end class 

i need parameter though, because says old time (before time change). how should go this? there way without re-implementing servicebase myself?