pitrou commented on pull request #12528:
URL: https://github.com/apache/arrow/pull/12528#issuecomment-1060964779
Still, this example doesn't make sense to me:
```c++
const char* times = R"(["2018-10-28 01:20:00"])";
const char* times_earliest = R"(["2018-10-28 00:30:00"])";
const char* times_latest = R"(["2018-10-28 01:30:00"])";
```
The only correct answer here is `2018-10-28 01:30:00` (because ceil should
produce a timestamp that is not _before_ the input timestamp). And so there is
no ambiguity.
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