rok commented on PR #12154:
URL: https://github.com/apache/arrow/pull/12154#issuecomment-1169618227
> Another bug report for you @rok, sorry 😢
No worries! I was hoping this PR would surface issues with the C++
implementations if any :).
Does this look right as a test set?
```
library('lubridate')
ts <- c("1970-01-01T00:00:59.123456789","2000-02-29T23:23:23.999999999",
"1899-01-01T00:59:20.001001001","2033-05-18T03:33:20.000000000",
"2020-01-01T01:05:05.001", "2019-12-31T02:10:10.002",
"2019-12-30T03:15:15.003", "2009-12-31T04:20:20.004132",
"2010-01-01T05:25:25.005321", "2010-01-03T06:30:30.006163",
"2010-01-04T07:35:35", "2006-01-01T08:40:40",
"2005-12-31T09:45:45",
"2008-12-28T00:00:00", "2008-12-29T00:00:00", "2012-01-01
01:02:03")
x <- ymd_hms(ts, tz = "Australia/Sydney")
with_tz(floor_date(x, unit="15month"), "UTC")
[1] "1969-12-31 14:00:00 UTC" "1999-12-31 13:00:00 UTC"
[3] "1898-12-31 14:00:00 UTC" "2032-12-31 13:00:00 UTC"
[5] "2019-12-31 13:00:00 UTC" "2018-12-31 13:00:00 UTC"
[7] "2018-12-31 13:00:00 UTC" "2008-12-31 13:00:00 UTC"
[9] "2009-12-31 13:00:00 UTC" "2009-12-31 13:00:00 UTC"
[11] "2009-12-31 13:00:00 UTC" "2005-12-31 13:00:00 UTC"
[13] "2004-12-31 13:00:00 UTC" "2007-12-31 13:00:00 UTC"
[15] "2007-12-31 13:00:00 UTC" "2011-12-31 13:00:00 UTC"
```
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