[R] Dates stuff ... beginner question

[Uwe Ligges]

MMarques Power wrote:

> 
> Putting it simly I have a date in format YYYYMMDD
> Year month day
> 20030301
> and I need simply the day of the week as an integer or even as
> string...
> according to the documentation in ISOdate or strptime functions
> I need to format it ...
> 
> If I try something like :
> 
> strptime("20030301","%u")
> [1] "2004-04-15"
> 
> being %u the format value I need
> but as result I get the system actual date ??!?...
> 
> Using Windows XP and the latest R1.9.0
> I need something like 1 for sunday and the sequent values for the rest
> of the week.
> What am I doing wrong...?
> Any help is welcomed...

You are looking for, e.g.:

  format(strptime("20030301", "%Y%m%d"), "%A")


Note that the help says for format "%u":

" ... less widely implemented (e.g. not for output on Windows) ..."

Uwe Ligges



>                       Thanks in advance
>                       Marco Marques
> 
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