[GitHub] [arrow] wjones127 commented on pull request #12883: ARROW-16073: [R] clean-up date time unit testing once tzdb is available on Windows

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wjones127 commented on PR #12883:
URL: https://github.com/apache/arrow/pull/12883#issuecomment-1112273522

   > All window jobs seem to be tripping up in the same spot (involving formats)
   
   @dragosmg This is expected. We don't support locales other than the "C" locale, so you can't format timestamps in different locales. From my earlier research, this seems to be an issue with MINGW itself. R gets around this by vendoring the strftime implementation:
   
   > However, not all OSes (notably Windows) provided strptime and many issues were found for those which did, so since 2000 R has used a fork of code from glibc. The forked code uses the system's strftime to find the locale-specific day and month names and any AM/PM indicator.
   >
   >On some platforms (including Windows and by default on macOS) the system's strftime is replaced (along with most of the rest of the C-level datetime code) by code modified from IANA's tzcode distribution (https://www.iana.org/time-zones).
   
   


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