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https://issues.apache.org/jira/browse/ARROW-14827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17488815#comment-17488815
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Dragoș Moldovan-Grünfeld commented on ARROW-14827:
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[~westonpace] In R for a "timestamp without timezone" it returns FALSE (because
it assumes UTC). For x being of class "Date":
{code:r}
x <- lubridate::ymd("2012-03-26")
x
#> [1] "2012-03-26"
class(x)
#> [1] "Date"
attributes(x)
#> $class
#> [1] "Date"
attr(x, "tzone")
#> NULL
lubridate::dst(x)
#> [1] FALSE
{code}
the default (and single) method converts the input to a {{POSIXlt}} object,
which stores DST info in its {{$isdst}} slot.
{code:r}
x <- lubridate::ymd("2012-03-26")
print.default(as.POSIXlt(x))
#> $sec
#> [1] 0
#>
#> $min
#> [1] 0
#>
#> $hour
#> [1] 0
#>
#> $mday
#> [1] 26
#>
#> $mon
#> [1] 2
#>
#> $year
#> [1] 112
#>
#> $wday
#> [1] 1
#>
#> $yday
#> [1] 85
#>
#> $isdst
#> [1] 0
#>
#> attr(,"class")
#> [1] "POSIXlt" "POSIXt"
#> attr(,"tzone")
#> [1] "UTC"
{code}
> [C++] Temporal component extraction function for extracting dst indicator
> -------------------------------------------------------------------------
>
> Key: ARROW-14827
> URL: https://issues.apache.org/jira/browse/ARROW-14827
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Nicola Crane
> Priority: Minor
> Labels: good-second-issue, kernel
>
> This would return "true" if DST is in effect at the given date and "false" if
> DST is not in effect.
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