CLASS runoff mrro observation file in ILAMB has an int64 time axis instead of float64

[mcguirepatr]

I recently did ilamb-fetch for the first time in a long time.
I ran ILAMB2.7 (head of trunk version), and the CLASS runoff mrro observation file failed.
I later found that if I change the int64 time axis for the CLASS runoff mrro observation file to a float64 time axis, that it works fine. I didn't succeed in getting both variables (mrro and mrro_sd), but the the mrro variable in the NETCDF with the corrected time axis works.
Can you fix this?
Attached is my code which uses iris to fix this CLASS runoff mrro file.
Patrick
process_CLASS_mrro_obs.py.txt