from cpython.datetime cimport datetime
from numpy cimport int64_t


cdef int64_t NPY_NAT

cdef bint _nat_scalar_rules[6]
cdef set c_nat_strings

cdef class _NaT(datetime):
    cdef readonly:
        int64_t value

cdef _NaT c_NaT


cdef bint checknull_with_nat(object val)
cdef bint is_dt64nat(object val)
cdef bint is_td64nat(object val)