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https://github.com/pydata/xarray/pull/1252#issuecomment-280726382 https://api.github.com/repos/pydata/xarray/issues/1252 280726382 MDEyOklzc3VlQ29tbWVudDI4MDcyNjM4Mg== 6200806 2017-02-17T18:18:48Z 2017-02-17T18:18:48Z CONTRIBUTOR

@spencerkclark @shoyer I got some more concrete information c.f. on my previous comment on negative and/or 5 digit dates. The TRACE simulation outputs netCDF files uses units of thousands of years relative to 1950, and therefore doesn't use 5 integers. But it does use negative and positive floats...negative for <1950, positive for >1950.

Re: 5 digits, there is growing research interest in very long climate model integrations, e.g. http://www.longrunmip.org/, but even those for now appear <10k yr in duration.

But there are also so called EMICs (Earth Models of Intermediate Complexity) that are cheap to run for 1000s of years. Although I couldn't immediately find any published results using them for >10k yr duration...

So ultimately I'd say there definitely exists a use-case for negative times (albeit with odd format) and there likely exists a use-case for 5 digit years. IMHO these are not must-haves for the initial netcdftime implementation but should at least be kept in mind, i.e. code design that makes them not-overly-difficult to introduce eventually.

I suspect there are xarray users with more direct experience with these cases...feel free to chime in

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