[R] Unexpected date format coercion

[Uwe Ligges]

On 01.07.2021 10:06, Jeremie Juste wrote:
> Hello,
> 
> I have been surprised when converting a character string to a date with the following
> format,
> 
> in R 4.1.0 (linux debian 10)
> 
> as.Date("20-12-2020","%Y-%m-%d")
> [1] "20-12-20"
> 
> in R 4.0.5 (window 10)
> 
> as.Date("20-12-2020","%Y-%m-%d")
> [1] "0020-12-20"

Yes, it is rather strange to specify "2020" as the day and "20" as the 
4digits year, so different implementations may print the year in 2 or 4 
digits. What you want is actually

as.Date("20-12-2020","%d-%m-%Y")


Best,
Uwe Ligges






> 
> 
> Here I was expecting a blunt and sharp NA, am I missing something?
> 
> Best regards,
> Jeremie
> 
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