[R] date handling

[JeeBee]

D = as.POSIXlt(c("2005-07-01", "2005-07-02",
  "2005-07-03", "2005-07-04", "2005-07-05"))

> (Years = 1900+D$year)
[1] 2005 2005 2005 2005 2005

> (Months = D$mon+1)
[1] 7 7 7 7 7

> weekdays(D)
[1] "Friday"   "Saturday" "Sunday"   "Monday"   "Tuesday"

# you better check this one carefully !!!
(Weeknumbers = floor((D$yday+7)/7))


JeeBee


On Mon, 12 Dec 2005 12:59:11 +0100, Richard van Wingerden wrote:

> Hi,
> 
> Given a frame with calendar date's:
> 
> "2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05",etc.
> 
> I want to extract the following from these dates:
> 
> week number
> month number
> year number
> 
> Any ideas how to accomplish this?
> 
> Many thanks.
> 
> Regards,
> Richard
> 
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