[R] Date issues

[Gabor Grothendieck]

On Sat, Sep 18, 2010 at 11:25 AM, Santosh Srinivas
<santosh.srinivas at gmail.com> wrote:
> Strangely this is not working ... what am I doing wrong here?
>
>> tDate <- FnO_Data$Date[1]
>> tDate
> [1] 20090101
>> as.Date(c(tDate),format="%Y%m%d")
> [1] NA
>

Do you have zoo loaded?  If you do then a minimal reproducible example
(see last line of every message to r-help) is:

> library(zoo)
> as.Date(20090101, format = "%Y%m%d")
[1] NA

Note that numeric arguments here are treated as the number of days
since the Epoch and not as yyyymmdd.  As others have pointed out this
works:

> as.Date(as.character(20090101), format = "%Y%m%d")
[1] "2009-01-01"

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