Errors and OS Differences with as.POSIXct and as.POSIXlt
Hello,
R 4.0.3 on Ubuntu 20.04, sessionInfo() below.
A fix is to use as.POSIXct instead:
rui at rui:~$ Rscript --vanilla -e 'as.POSIXlt("2018-03-11 02:09",
tz="America/New_York")'
#[1] "2018-03-11 02:09:00 EDT"
rui at rui:~$ Rscript --vanilla -e 'as.POSIXct("2018-03-11 02:09",
tz="America/New_York")'
#[1] "2018-03-11 01:09:00 EST"
rui at rui:~$ Rscript --vanilla -e 'sessionInfo()'
R version 4.0.3 (2020-10-10)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.1 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.9.0
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.9.0
locale:
[1] LC_CTYPE=pt_PT.UTF-8 LC_NUMERIC=C
[3] LC_TIME=pt_PT.UTF-8 LC_COLLATE=pt_PT.UTF-8
[5] LC_MONETARY=pt_PT.UTF-8 LC_MESSAGES=pt_PT.UTF-8
[7] LC_PAPER=pt_PT.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=pt_PT.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.0.3
Hope this helps,
Rui Barradas
?s 01:56 de 19/01/21, Bill Denney escreveu:
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
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