R help - Oct 2010 - finding the year of a date

I know that I can use as.yearmon in the package "zoo" to find the year
and the month of a date.
I can use as. yearqtr to find the year and the quarter.
But how can one find just the year of a date?

Thanks a lot!

-- 
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com

Try this:

format(Sys.Date(), "%Y")

On Mon, Oct 25, 2010 at 2:38 PM, Dimitri Liakhovitski <
dimitri.liakhovitski@gmail.com> wrote:
> I know that I can use as.yearmon in the package "zoo" to find the
year
> and the month of a date.
> I can use as. yearqtr to find the year and the quarter.
> But how can one find just the year of a date?
>
> Thanks a lot!
>
> --
> 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

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On Mon, Oct 25, 2010 at 12:38 PM, Dimitri Liakhovitski
<dimitri.liakhovitski at gmail.com> wrote:
> I know that I can use as.yearmon in the package "zoo" to find the
year
> and the month of a date.
> I can use as. yearqtr to find the year and the quarter.
> But how can one find just the year of a date?
>
> Thanks a lot!
Here are three ways.  The first uses the fact that the year is the
whole number part of a yearmon object.
> library(zoo)
> d <- Sys.Date()
> floor(as.numeric(as.yearmon(d)))
[1] 2010
>
> as.numeric(format(d, "%Y"))
[1] 2010
>
> as.POSIXlt(d)$year + 1900
[1] 2010

-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com

Thank you very much!
Dimitri

On Mon, Oct 25, 2010 at 12:46 PM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
> On Mon, Oct 25, 2010 at 12:38 PM, Dimitri Liakhovitski
> <dimitri.liakhovitski at gmail.com> wrote:
>> I know that I can use as.yearmon in the package "zoo" to find
the year
>> and the month of a date.
>> I can use as. yearqtr to find the year and the quarter.
>> But how can one find just the year of a date?
>>
>> Thanks a lot!
>
> Here are three ways. ?The first uses the fact that the year is the
> whole number part of a yearmon object.
>
>> library(zoo)
>> d <- Sys.Date()
>> floor(as.numeric(as.yearmon(d)))
> [1] 2010
>>
>> as.numeric(format(d, "%Y"))
> [1] 2010
>>
>> as.POSIXlt(d)$year + 1900
> [1] 2010
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
>


-- 
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com