Unable to convert gregorian datetime objects to datetime

[micahjohnson150]

When running basin_setup 0.14.4. in docker grm is attempting to convert datetimes from from num2date. It throws an exception like the following:

ERROR <class 'cftime._cftime.DatetimeGregorian'> is not convertible to datetime

Turns out... this is due to netCDF4 which relies on a package called cftime. cftime is also developed by the unidata folks and it is unpinned in their requirements in netcdf4. cftime was updated on 2/20/2020 which altered num2date which:

cftime.datetime instances are returned by default from num2date (instead of returning python datetime instances where possible

The fix is to pin cftime to less than 1.1.0