issues: 625123449

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
625123449 MDU6SXNzdWU2MjUxMjM0NDk= 4097 CFTime offsets missing for milli- and micro-seconds 20629530 closed 0     0 2020-05-26T19:13:37Z 2021-02-10T21:44:26Z 2021-02-10T21:44:25Z CONTRIBUTOR      

The smallest cftime offset defined in xarray.coding.cftime_offsets.py is "second" (S), but the precision of cftime objects goes down to the millisecond (L) and microsecond (U). They should be easily added.

PR #4033 adds a xr.infer_freq that supports the two, but they are currently untested as xr.cftime_range cannot generate an index.

MCVE Code Sample

python xr.cftime_range("2000-01-01", periods=3, freq='10L')

Expected Output

CFTimeIndex([2000-01-01 00:00:00, 2000-01-01 00:00:00.010000, 2000-01-01 00:00:00.020000], dtype='object')

Problem Description

An error gets raised : ValueError: Invalid frequency string provided.

Versions

Output of <tt>xr.show_versions()</tt> INSTALLED VERSIONS ------------------ commit: None python: 3.8.2 | packaged by conda-forge | (default, Apr 24 2020, 08:20:52) [GCC 7.3.0] python-bits: 64 OS: Linux OS-release: 5.6.13-arch1-1 machine: x86_64 processor: byteorder: little LC_ALL: None LANG: fr_CA.utf8 LOCALE: fr_CA.UTF-8 libhdf5: 1.10.5 libnetcdf: 4.7.4 xarray: 0.15.2.dev9+g6378a711.d20200505 pandas: 1.0.3 numpy: 1.18.4 scipy: 1.4.1 netCDF4: 1.5.3 pydap: None h5netcdf: None h5py: 2.10.0 Nio: None zarr: None cftime: 1.1.1.2 nc_time_axis: 1.2.0 PseudoNetCDF: None rasterio: None cfgrib: None iris: None bottleneck: 1.3.2 dask: 2.16.0 distributed: 2.16.0 matplotlib: 3.2.1 cartopy: None seaborn: None numbagg: None pint: 0.11 setuptools: 46.1.3.post20200325 pip: 20.0.2 conda: None pytest: 5.4.1 IPython: 7.13.0 sphinx: 3.0.2 
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