inline unsigned __int64 to_integral( const SYSTEMTIME& st )
{
   FILETIME ft ;
   SystemTimeToFileTime( &st, &ft ) ;
   ULARGE_INTEGER integer ;
   integer.LowPart = ft.dwLowDateTime ;
   integer.HighPart = ft.dwHighDateTime ;
   return integer.QuadPart ;
}
 
inline bool operator== ( const SYSTEMTIME& a, const SYSTEMTIME& b )
{ return to_integral(a) == to_integral(b) ; }
inline bool operator< ( const SYSTEMTIME& a, const SYSTEMTIME& b )
{ return to_integral(a) < to_integral(b) ; }
inline bool operator<= ( const SYSTEMTIME& a, const SYSTEMTIME& b )
{ return to_integral(a) <= to_integral(b) ; }
inline bool operator!= ( const SYSTEMTIME& a, const SYSTEMTIME& b ) 
{ return !( a==b ) ; }
inline bool operator> ( const SYSTEMTIME& a, const SYSTEMTIME& b ) 
{ return !( a<=b ) ; }
inline bool operator>= ( const SYSTEMTIME& a, const SYSTEMTIME& b ) 
{ return !( a<b ) ; }