There should be a way to silence the DeprecationWarning

[greglucas]

We are currently getting these deprecation warnings:

DeprecationWarning: datetime64_to_cdftt2000 will eventually be phased out. Instead, datetime64 types will automatically be converted into a CDF time type. If you do not wish datetime64 arrays to be converted, cast them to a different type prior to calling xarray_to_cdf()

even when leaving out the keyword argument in the call. This is because there is a default keyword argument still in the signature which makes this case always hit.

cdflib/cdflib/xarray/xarray_to_cdf.py

Lines 1003 to 1008 in 88ba11e

	if datetime64_to_cdftt2000:
	warn(
	"datetime64_to_cdftt2000 will eventually be phased out. Instead, datetime64 types will automatically be converted into a CDF time type. If you do not wish datetime64 arrays to be converted, cast them to a different type prior to calling xarray_to_cdf()",
	DeprecationWarning,
	stacklevel=2,
	)

I think you might be able to add a **kwargs catch-all here for the deprecation warning and see if datetime64_to_cdftt2000 is in kwargs and issue the deprecation warning then.