[R] Date extract Year
Frederic Ntirenganya
ntfredo at gmail.com
Sun Mar 8 17:41:59 CET 2015
Hi Steve,
Can you please explain to us your date column? thanks.
Regards,
Fredo.
On Mar 8, 2015 7:32 PM, "Steve Archambault" <archstevej at gmail.com> wrote:
> Hi all,
>
> I am trying in vain to create a new object "Year" in my data frame from
> existing Date data. I have tried many different approaches, but can't seem
> to get it to work. Here is an example of some code I tried.
>
> date1<- as.Date(wells$Date,"%m/%d/%Y")
> wells$year<-as.numeric(format(date1, "%Y"))
>
> I am starting with data that looks like this.
>
> ID Date DepthtoWater_bgs test test2
> 1 BC-0004 41163 260.60 3 1
> 2 BC-0004 41255 261.65 4 2
> 3 BC-0003 41345 166.58 5 3
> 4 BC-0002 41351 317.85 6 4
> 5 BC-0004 41355 262.15 7 5
> 6 BC-0003 41438 167.55 8 6
> 7 BC-0004 41438 265.45 9 7
> 8 BC-0002 41443 317.25 10 8
> 9 BC-0002 41521 321.25 11 9
> 10 BC-0003 41522 168.65 12 10
> 11 BC-0004 41522 266.15 13 11
> 12 BC-0003 41627 168.95 14 12
> 13 BC-0004 41627 265.25 15 13
> 14 BC-0002 41634 312.31 16 14
> 15 BC-0003 41703 169.25 17 15
> 16 BC-0004 41703 265.05 18 16
> 17 BC-0002 41710 313.01 19 17
> 18 BC-0003 41795 168.85 20 18
> 19 BC-0004 41795 266.95 21 19
> 20 BC-0002 41801 330.41 22 20
> 21 BC-0003 41905 169.75 23 21
> 22 BC-0004 41905 267.75 24 22
> 23 BC-0002 41906 321.01 25 23
>
> Any help would be greatly appreciated!
>
>
> -Steve
>
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