[R] column of dates into time series

[DispersionMap]

i have a column of dates in this format:

data[,"Raised.Date"] <- as.Date(data[,"Raised.Date"], "%d/%m/%Y"); 
data[1:10,"Raised.Date"]
[1] "2006-07-07" "2006-07-07" "2006-04-03" "2006-04-03" "2006-04-03"
"2006-04-03" "2006-04-03" "2006-04-03" "2006-04-03" "2006-04-03"

I can turn them into months like this...

Month<-months(data[,"Raised.Date"])
Month[1:10]
[1] "July"  "July"  "April" "April" "April" "April" "April" "April" "April"
"April"


But i also want to turn them into years (and also weeks later on), so tried
this...

Year<-year(data[,"Raised.Date"])
Error: could not find function "year"


thanks.
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