  A choice of time-slicing in classical general relativity permits the
construction of time-dependent wave functions in the ``frozen time''
Chern-Simons formulation of $(2+1)$-dimensional quantum gravity. Because of
operator ordering ambiguities, however, these wave functions are not unique. It
is shown that when space has the topology of a torus, suitable operator
orderings give rise to wave functions that transform under the modular group as
automorphic functions of arbitrary weights, with dynamics determined by the
corresponding Maass Laplacians on moduli space.
