def is_datetime64tz_dtype(arr_or_dtype):
if arr_or_dtype is None:<EOL><INDENT>return False<EOL><DEDENT>return DatetimeTZDtype.is_dtype(arr_or_dtype)<EOL>
Check whether an array-like or dtype is of a DatetimeTZDtype dtype.

Parameters
----------
arr_or_dtype : array-like
    The array-like or dtype to check.

Returns
-------
boolean
    Whether or not the array-like or dtype is of a DatetimeTZDtype dtype.

Examples
--------
>>> is_datetime64tz_dtype(object)
False
>>> is_datetime64tz_dtype([1, 2, 3])
False
>>> is_datetime64tz_dtype(pd.DatetimeIndex([1, 2, 3]))  # tz-naive
False
>>> is_datetime64tz_dtype(pd.DatetimeIndex([1, 2, 3], tz="US/Eastern"))
True

>>> dtype = DatetimeTZDtype("ns", tz="US/Eastern")
>>> s = pd.Series([], dtype=dtype)
>>> is_datetime64tz_dtype(dtype)
True
>>> is_datetime64tz_dtype(s)
True