jorisvandenbossche commented on PR #12528:
URL: https://github.com/apache/arrow/pull/12528#issuecomment-1131369183

   Lubridate:
   
   ```
   > x <- ymd_hms(c("2015-03-29 01:50:00", "2015-03-29 01:59:59", "2015-03-29 
03:00:00", "2015-03-29 03:10:00"), tz = "Europe/Brussels")
   > x
   [1] "2015-03-29 01:50:00 CET"  "2015-03-29 01:59:59 CET" 
   [3] "2015-03-29 03:00:00 CEST" "2015-03-29 03:10:00 CEST"
   > round_date(x, "16 mins")
   [1] "2015-03-29 01:48:00 CET"  "2015-03-29 03:04:00 CEST"
   [3] "2015-03-29 03:00:00 CEST" "2015-03-29 03:16:00 CEST"
   ```
   
   (I haven't yet tried to understand the logic behind those results, but so 
none of the 4 values match with any of the values that this PR currently 
returns ...)
   
   In pandas:
   
   ```
   x = pd.Series(pd.to_datetime(["2015-03-29 01:50:00", "2015-03-29 01:59:59", 
"2015-03-29 03:00:00", "2015-03-29 03:10:00"]).tz_localize("Europe/Brussels"))
   
   In [9]: x
   Out[9]: 
   0   2015-03-29 01:50:00+01:00
   1   2015-03-29 01:59:59+01:00
   2   2015-03-29 03:00:00+02:00
   3   2015-03-29 03:10:00+02:00
   dtype: datetime64[ns, Europe/Brussels]
   
   In [12]: x.dt.round("16min", nonexistent="NaT")
   Out[12]: 
   0   2015-03-29 01:52:00+01:00
   1   2015-03-29 01:52:00+01:00
   2                         NaT
   3   2015-03-29 03:12:00+02:00
   dtype: datetime64[ns, Europe/Brussels]
   ```


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