[R] Error in as.POSIXlt.character(x, tz, ...)

[Jinsong Zhao]

On 2023/5/11 17:22, Ivan Krylov wrote:
> В Thu, 11 May 2023 16:56:41 +0800
> Jinsong Zhao <jszhao using yeah.net> пишет:
> 
>> When I run the following code in R 4.3.0 on FreeBSD, I got error.
>>
>>   > as.POSIXct("1970-01-01 00:00.00 UTC")
>> Error in as.POSIXlt.character(x, tz, ...) :
>>     character string is not in a standard unambiguous format
> 
> Do strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d %H:%M", '') and
> strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d", '') both return NA for
> you on FreeBSD? If not, can you trace the execution using R's debugger
> to see which parts are returned as NA, failing the test in
> as.POSIXlt.character?

Both codes do not return NA on FreeBSD:

 > strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d %H:%M", '')
[1] "1970-01-01 CST"
 > strptime("1970-01-01 00:00.00 UTC", "%Y-%m-%d", '')
[1] "1970-01-01 CST"

I do not know how to use R's debugger...

> 
> I think that strptime() should have discarded the trailing parts of the
> string and matched at least the beginning (though not the ".00 UTC"
> part because it doesn't correspond to the formats tried by strptime()).
> Moreover, there shouldn't be significant difference between the
> platforms, because R seems to always use an internal implementation of
> strptime(). Are you using a multi-byte locale? (What's your
> sessionInfo() on both a system where it works and the system where it
> fails?)
> 

The sessionInfo on FreeBSD said:
tzcode source: system (FreeBSD)

But on Windows it said:
tzcode source: internal

Could it be because of this?


The sessionInfo on FreeBSD is:

 > sessionInfo()
R version 4.3.0 (2023-04-21)
Platform: amd64-portbld-freebsd13.1 (64-bit)
Running under: FreeBSD xw6600 13.2-RELEASE FreeBSD 13.2-RELEASE 
releng/13.2-n254617-525ecfdad597 GENERIC amd64

Matrix products: default
LAPACK: /usr/local/lib/R/lib/libRlapack.so.4.3.0;  LAPACK version 3.11.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: Asia/Shanghai
tzcode source: system (FreeBSD)

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_4.3.0

The sessionInfo on Windows is:
 > sessionInfo()
R version 4.3.0 (2023-04-21 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 11 x64 (build 22621)

Matrix products: default


locale:
[1] LC_COLLATE=Chinese (Simplified)_China.utf8
[2] LC_CTYPE=Chinese (Simplified)_China.utf8
[3] LC_MONETARY=Chinese (Simplified)_China.utf8
[4] LC_NUMERIC=C
[5] LC_TIME=Chinese (Simplified)_China.utf8

time zone: Asia/Shanghai
tzcode source: internal

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_4.3.0 tools_4.3.0
 >

The sessionInfo on CentOS is:
 > sessionInfo()
R version 4.1.2 (2021-11-01)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)

Matrix products: default
BLAS:   /home/jszhao/software/lib64/R/lib/libRblas.so
LAPACK: /home/jszhao/software/lib64/R/lib/libRlapack.so

locale:
  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
  [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.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_4.1.2
 >