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1812504689 I_kwDOAMm_X85sCKBx 8006 Fix documentation about datetime_unit of xarray.DataArray.differentiate dcherian 2448579 closed 0     0 2023-07-19T18:31:10Z 2023-09-01T09:37:15Z 2023-09-01T09:37:15Z MEMBER      

Should say that Y and M cannot be supported with datetime64

Discussed in https://github.com/pydata/xarray/discussions/8000

<sup>Originally posted by **jesieleo** July 19, 2023</sup> I have a piece of data that looks like this ``` <xarray.Dataset> Dimensions: (time: 612, LEV: 15, latitude: 20, longitude: 357) Coordinates: * time (time) datetime64[ns] 1960-01-15 1960-02-15 ... 2010-12-15 * LEV (LEV) float64 5.01 15.07 25.28 35.76 ... 149.0 171.4 197.8 229.5 * latitude (latitude) float64 -4.75 -4.25 -3.75 -3.25 ... 3.75 4.25 4.75 * longitude (longitude) float64 114.2 114.8 115.2 115.8 ... 291.2 291.8 292.2 Data variables: u (time, LEV, latitude, longitude) float32 ... Attributes: (12/30) cdm_data_type: Grid Conventions: COARDS, CF-1.6, ACDD-1.3 creator_email: chepurin@umd.edu creator_name: APDRC creator_type: institution creator_url: https://www.atmos.umd.edu/~ocean/ ... ... standard_name_vocabulary: CF Standard Name Table v29 summary: Simple Ocean Data Assimilation (SODA) soda po... time_coverage_end: 2010-12-15T00:00:00Z time_coverage_start: 1983-01-15T00:00:00Z title: SODA soda pop2.2.4 [TIME][LEV][LAT][LON] Westernmost_Easting: 118.25 ``` when i try to use xarray.DataArray.differentiate `data.u.differentiate('time',datetime_unit='M')` will appear ``` Traceback (most recent call last): File "<stdin>", line 1, in <module> File "D:\Anaconda3\lib\site-packages\xarray\core\dataarray.py", line 3609, in differentiate ds = self._to_temp_dataset().differentiate(coord, edge_order, datetime_unit) File "D:\Anaconda3\lib\site-packages\xarray\core\dataset.py", line 6372, in differentiate coord_var = coord_var._to_numeric(datetime_unit=datetime_unit) File "D:\Anaconda3\lib\site-packages\xarray\core\variable.py", line 2428, in _to_numeric numeric_array = duck_array_ops.datetime_to_numeric( File "D:\Anaconda3\lib\site-packages\xarray\core\duck_array_ops.py", line 466, in datetime_to_numeric array = array / np.timedelta64(1, datetime_unit) TypeError: Cannot get a common metadata divisor for Numpy datatime metadata [ns] and [M] because they have incompatible nonlinear base time units. ``` Would you please told me is this a BUG?
 
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   completed xarray 13221727 issue
1812646094 PR_kwDOAMm_X85V7g7q 8007 Update copyright year in README dcherian 2448579 closed 0     0 2023-07-19T20:00:50Z 2023-07-20T21:13:27Z 2023-07-20T21:13:26Z MEMBER   0 pydata/xarray/pulls/8007   
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     xarray 13221727 pull

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