  Using the Mathematica program we calculate numerically the difference of the
diagonal matrix elements of the time dependent effective Hamiltonian for the
neutral K meson complex. We consider the exactly solvable neutral K meson model
based on the one-pole approximation for the mass density. The so-called
Khalfin's Theorem is numerically examined. Some characteristic parameters for
this system are also calculated. The results of all calculations are presented
in the graphical form. The calculations are made assuming the total system is
CPT -- invariant and CP -- noninvariant.
