R help - Aug 2010 - transforming dates into years

Hello!

If I have in my data frame MyFrame a variable saved as a Date and want
to translate it into years, I currently do it like this using "zoo":

library(zoo)
as.year <- function(x) as.numeric(floor(as.yearmon(x)))
myFrame$year<-as.year(myFrame$date)

Is there a function that would do it directly - like "as.yearmon" -
but for years?

Thank you!


-- 
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com

You've tried:

 as.numeric(format(Sys.Date(), '%Y'))

On Fri, Aug 13, 2010 at 4:36 PM, Dimitri Liakhovitski <
dimitri.liakhovitski@gmail.com> wrote:
> Hello!
>
> If I have in my data frame MyFrame a variable saved as a Date and want
> to translate it into years, I currently do it like this using
"zoo":
>
> library(zoo)
> as.year <- function(x) as.numeric(floor(as.yearmon(x)))
> myFrame$year<-as.year(myFrame$date)
>
> Is there a function that would do it directly - like "as.yearmon"
-
> but for years?
>
> Thank you!
>
>
> --
> Dimitri Liakhovitski
> Ninah Consulting
> www.ninah.com
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

	[[alternative HTML version deleted]]

myFrame$year<-years(strptime(x))

On Fri, Aug 13, 2010 at 12:36 PM, Dimitri Liakhovitski
<dimitri.liakhovitski at gmail.com> wrote:
> Hello!
>
> If I have in my data frame MyFrame a variable saved as a Date and want
> to translate it into years, I currently do it like this using
"zoo":
>
> library(zoo)
> as.year <- function(x) as.numeric(floor(as.yearmon(x)))
> myFrame$year<-as.year(myFrame$date)
>
> Is there a function that would do it directly - like "as.yearmon"
-
> but for years?
>
> Thank you!
>
>
> --
> Dimitri Liakhovitski
> Ninah Consulting
> www.ninah.com
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

On Aug 13, 2010, at 3:36 PM, Dimitri Liakhovitski wrote:
> Hello!
>
> If I have in my data frame MyFrame a variable saved as a Date and want
> to translate it into years, I currently do it like this using
"zoo":
>
> library(zoo)
> as.year <- function(x) as.numeric(floor(as.yearmon(x)))
> myFrame$year<-as.year(myFrame$date)
>
> Is there a function that would do it directly - like "as.yearmon"
-
> but for years?
I suspect most would just use format:

?format
 > dd <- as.Date("2010-01-01")
 > format(dd, "%Y")
[1] "2010"


-- 
David Winsemius, MD
West Hartford, CT