Dear list members,
I have come about a peculiar behavior in R (4.0.2) which I would
describe as a bug.
On macOS, where `strptime()` raises a warning for invalid timezone
identifiers, the following code will continue to raise the original
warning with every subsequent call to `strptime()`:
```
# attach a handler for warnings for this call only:
tryCatch(strptime('2020-10-31 18:30', format = '%Y-%m-%d %H:%M', tz =
'Wrong Timezone!'),
warning = function (w) { stop("Error") })
# but every subsequent call will emit the original warning ("unknown
timezone 'Wrong Timezone!'")
strptime('2020-10-31 18:30', format = '%Y-%m-%d %H:%M', tz = 'Europe/Vienna')
strptime('2020-10-31 18:30', format = '%Y-%m-%d %H:%M', tz = 'GMT')
```
The output of the code above in R 4.0.2 on macOS is:
> tryCatch(strptime('2020-10-31 18:30', format = '%Y-%m-%d %H:%M', tz = 'Wrong
> Timezone!'),
+ warning = function (w) { stop("Error") })
Error in value[[3L]](cond) : Error
>
> strptime('2020-10-31 18:30', format = '%Y-%m-%d %H:%M', tz = 'Europe/Vienna')
[1] "2020-10-31 18:30:00 CET"
Warning message:
In strptime("2020-10-31 18:30", format = "%Y-%m-%d %H:%M", tz =
"Europe/Vienna") :
unknown timezone 'Wrong Timezone!'
> strptime('2020-10-31 18:30', format = '%Y-%m-%d %H:%M', tz = 'GMT')
[1] "2020-10-31 18:30:00 GMT"
Warning messages:
1: In strptime("2020-10-31 18:30", format = "%Y-%m-%d %H:%M", tz = "GMT") :
unknown timezone 'Wrong Timezone!'
The corresponding R session info is:
> sessionInfo()
R version 4.0.2 Patched (2020-07-13 r78838)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.7
Matrix products: default
BLAS:
/Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRblas.dylib
LAPACK:
/Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.0.2
I get the same odd behavior when attaching calling handlers with
`withCallingHandlers()`.
On RHEL 7 and Cent OS 6, which both don't issue warnings for invalid
timezones, the above code works.
I don't see anything wrong with the code itself, but maybe I am
missing something. Any input would be appreciated.
Best wishes,
David
______________________________________________
R-help@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.
