Joris Van den Bossche created ARROW-13033:
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             Summary: [C++] Kernel to localize naive timestamps to a timezone 
(preserving clock-time)
                 Key: ARROW-13033
                 URL: https://issues.apache.org/jira/browse/ARROW-13033
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Joris Van den Bossche


Given a tz-naive timestamp, "localize" would interpret that timestamp as local 
in a given timezone, and return a tz-aware timestamp keeping the same "clock 
time" (the same year/month/day/hour/etc in the printed representation). Under 
the hood this converts the timestamp value from that timezone to UTC, since 
tz-aware timestamps are stored as UTC.

References: 
[tz_localize|https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DatetimeIndex.tz_localize.html]
 in pandas, or 
[force_tz|https://lubridate.tidyverse.org/reference/force_tz.html] in R's 
lubridate package

This will (eventually) also have to deal with ambiguous or non-existing times.



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