[R] as.Date function error

[Achim Zeileis]

On Sun, 17 Apr 2011, Wonjae Lee wrote:

> Hi,
>
> I have some problems with as.Date function.
> After I applied as.Date for my data, "2010" changed to "2020" as below
> Where am I wrong?

You used %y (two-digit year, here: "20" and then expanded to "2020") 
instead of %Y (four-digit year, here "2010").

Using as.Date(x,"%m/%d/%Y") yields the desired result.
Z



> Thanks
>
> Wonjae
>
>> x=c("11/16/2010","11/17/2010","11/18/2010","11/19/2010")
>> x=as.Date(x,"%m/%d/%y")
>> x
> [1] "2020-11-16" "2020-11-17" "2020-11-18" "2020-11-19"
>
> my R veision is 2.12.2.
>
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