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
1583216781,I_kwDOAMm_X85eXfiN,7525,contiguous time axis ,11522898,closed,0,,,6,2023-02-13T23:13:09Z,2023-03-01T04:59:58Z,2023-02-28T23:17:08Z,NONE,,,,"### What is your issue?

I have a [dataset](https://github.com/pydata/xarray/files/10726921/precMerge.zip) I created using `xarray`.  When I am using `netcdf-java` to read the time axis, I am getting edges that aren't the same values as the time axis coordinates.

The xarray-developed dataset looks like:

![image](https://user-images.githubusercontent.com/11522898/218593264-619f8005-5245-40db-8646-ed93c3677c29.png)

From `netcdf-java` I see the [CoordinateAxis1DTime](https://docs.unidata.ucar.edu/netcdf-java/current/javadoc/ucar/nc2/dataset/CoordinateAxis1D.html) axis with the following attributes:

![image](https://user-images.githubusercontent.com/11522898/218595339-c7c3e1ea-47d2-4f51-bdd1-12fbfb490f3c.png)


The edge array is offset by -0.5 days.  After a little digging through the java docs, I found the `CoordinateAxis1DTime.edge` array will only be the same as the `CoordinateAxis1DTime.coords` array when the [`ContiniousAxis1DTime.isContiguous()`](https://docs.unidata.ucar.edu/netcdf-java/current/javadoc/ucar/nc2/dataset/CoordinateAxis1D.html#isContiguous--) evaluates as True.  But the java docs indicate:

![image](https://user-images.githubusercontent.com/11522898/218594368-a991b668-4741-427f-b823-44a4991f6f14.png)


How can I write a netcdf file using xarray where the time axis would be considered contiguous?

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