[issue31327] [doc] Add example of platform-specific support for negative timestamps to the time doc

[Stanley]

Change by Stanley <ostanley.lee at gmail.com>:


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keywords: +patch
nosy: +slateny
nosy_count: 8.0 -> 9.0
pull_requests: +29589
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/31460

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31327>
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