Writing RTF document with auto-date formatting behaves unexpectedly in non-english system locales

[mstackhouse]

Copying issue text from here

@NNaikp could you share your output on timestamp and R language setting? Thanks!

Github doesn't support .rtf so I have attached the file here (tlf-primary.docx) as .docx. Here is also a screenshot from the .rtf file:

My default language in Word is UK english.

When I did the review I set Sys.setenv(LANG = "en") as it was showing me error messages in danish. But after some googling I can see that the locale is still Danish, also if I set the language to English:

> Sys.setenv(LANG = "en")
> Sys.getlocale()
[1] "LC_COLLATE=Danish_Denmark.1252;LC_CTYPE=Danish_Denmark.1252;LC_MONETARY=Danish_Denmark.1252;LC_NUMERIC=C;LC_TIME=Danish_Denmark.1252"

After running Sys.setlocale(locale = "English") I see

> Sys.setlocale(locale = "English")
[1] "LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252"

Which yields:

Maybe pharmaRTF::write_rtf needs to check the locale before sinking the file? I can see from the documentation of Sys.setlocale() that it is OS dependent. The one above is Windows (my local). This one is from a linux server:

> Sys.getlocale()
[1] "LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C"