[R] Errors and OS Differences with as.POSIXct and as.POSIXlt

[Jeff Newmiller]

This is as described in the documentation, due to OS differences, e.g
 [1].

[1] https://stat.ethz.ch/R-manual/R-devel/library/base/html/strptime.html

On January 18, 2021 5:56:11 PM PST, Bill Denney <wdenney using humanpredictions.com> wrote:
>Hello,
>
>
>
>Dates created with as.POSIXct differ between Windows/Mac and Linux.
>Specifically this time that is during a gap when the hour does not
>exist
>due to daylight savings time:
>
>
>
>as.POSIXct("2018-03-11 02:09:36", tz="America/New_York")
>
>
>
>Gives on Windows:
>
>[1] "2018-03-11 EST"
>
>Gives on Linux (Ubuntu 20.04):
>
>[1] "2018-03-11 01:09:36 EST"
>
>
>
>Since the time does not exist, and I think that NA should be returned.
>
>
>
>Another issue and difference is that with as.POSIXlt on Linux, the
>invalid
>time is presented:
>
>
>
>as.POSIXlt("2018-03-11 02:09", tz="America/New_York")
>
>
>
>Gives on Windows:
>
>[1] "2018-03-11 EST"
>
>Gives on Linux:
>
>[1] "2018-03-11 02:09:00 EDT"
>
>
>
>(Note that the time provided on Linux does not exist due to daylight
>savings time.)
>
>
>
>I think that for any invalid time, the result should be the same as an
>invalid date:  NA is returned.
>
>
>
>What is the intended, appropriate time, and what is the best way to fix
>this?
>
>
>
>Thanks,
>
>
>
>Bill
>
>	[[alternative HTML version deleted]]
>
>______________________________________________
>R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

-- 
Sent from my phone. Please excuse my brevity.