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Description
What happened?
I want to use the xarray.cftime_range function to get a set of datetimes between two cftime.datetime objects that use the proleptic_gregorian calendar. However, when I use this function with this calendar, I receive the following error:
File "/Users/Alexander/miniconda3/envs/xrtest/lib/python3.11/site-packages/xarray/core/resample_cftime.py", line 491, in exact_cftime_datetime_difference
seconds = b.replace(microsecond=0) - a.replace(microsecond=0)
~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
File "src/cftime/_cftime.pyx", line 1574, in cftime._cftime.datetime.__sub__
TypeError: cannot compute the time difference between dates with different calendars
What did you expect to happen?
I expect this function to return a list of dates between the two dates I selected, with each date spaced by one day. In the minimal example, I provide the expected output obtained when I instead use the cftime.DatetimeProlepticGregorian object.
Minimal Complete Verifiable Example
#xarray==2024.3.0
#cftime==1.6.3
import xarray as xr
import cftime
start_date = cftime.DatetimeProlepticGregorian(1,1,1)
end_date = cftime.DatetimeProlepticGregorian(2,1,1)
daterange = xr.cftime_range(start_date, end_date, calendar='proleptic_gregorian')
print(daterange)
start_date = cftime.datetime(1,1,1,calendar = 'proleptic_gregorian')
end_date = cftime.datetime(2,1,1,calendar = 'proleptic_gregorian')
daterange = xr.cftime_range(start_date, end_date, calendar='proleptic_gregorian')
print(daterange)MVCE confirmation
- Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
- Complete example — the example is self-contained, including all data and the text of any traceback.
- Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
- New issue — a search of GitHub Issues suggests this is not a duplicate.
- Recent environment — the issue occurs with the latest version of xarray and its dependencies.
Relevant log output
No response
Anything else we need to know?
No response
Environment
INSTALLED VERSIONS
------------------
commit: None
python: 3.11.8 | packaged by conda-forge | (main, Feb 16 2024, 20:49:36) [Clang 16.0.6 ]
python-bits: 64
OS: Darwin
OS-release: 23.4.0
machine: arm64
processor: arm
byteorder: little
LC_ALL: None
LANG: None
LOCALE: ('en_US', 'UTF-8')
libhdf5: None
libnetcdf: None
xarray: 2024.3.0
pandas: 2.2.2
numpy: 1.26.4
scipy: None
netCDF4: None
pydap: None
h5netcdf: None
h5py: None
Nio: None
zarr: None
cftime: 1.6.3
nc_time_axis: None
iris: None
bottleneck: None
dask: None
distributed: None
matplotlib: None
cartopy: None
seaborn: None
numbagg: None
fsspec: None
cupy: None
pint: None
sparse: None
flox: None
numpy_groupies: None
setuptools: 69.2.0
pip: 24.0
conda: None
pytest: None
mypy: None
IPython: None
sphinx: None