[R] How to get the day of the year

[Gavin Simpson]

On Wed, 2008-10-01 at 08:42 +0000, Solene Goy wrote:
> Hello,
> I am new to R and I would like to get the day of the year from
> numerous data in the following form:  %a %d/%b/%Y %H:%M:%S (for
> example from Tu 10/Jul/2007 21:59:13 I would like to get 191)
>  
> Whatever I try, I get NAs.

Tu isn't a valid abbreviated for for the day (in my locale at least),
which might explain the NAs and you don't show how you tried to get the
julien day.

Here are two ways that work.

> tmp <- as.Date("Tue 10/Jul/2007 21:59:13", format = "%a %d/%b/%Y %H:%M:%S")
> tmp
[1] "2007-07-10"
> format(tmp, "%j")
[1] "191"
> as.numeric(format(tmp, "%j"))
[1] 191
> tmp <- as.POSIXlt("Tue 10/Jul/2007 21:59:13", format = "%a %d/%b/%Y %H:%M:%S") 
> tmp
[1] "2007-07-10 21:59:13"
> format(tmp, format = "%j")
[1] "191"
> as.numeric(format(tmp, format = "%j"))
[1] 191

Is this what you wanted?

G

>  
> Well... I need your help, please!
> Thanks in advance
> Yours sincerely,
> Solne Goy
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