[R] Simple Date problems with cbind

[John Kane]

I am clearly misunderstanding something about dates
and my reading of the help and RSiteSearch have not
turned up anything. 

I have a variable of class "Date" and I want to add
include it in a data.frame. However when do a cbind
the date var is coerced into a numeric. 

However when I tried to create a example I also seem
to be doing something wrong as I cannot seem even  to
create a date class var even when I try to copy an
example from the Help

Example from Help
dates <- c("02/27/92", "02/27/92", "01/14/92",
"02/28/92", "02/01/92")
max <-as.Date(dates, "%m/%d/%y")
max
class(max)

Results
> dates <- c("02/27/92", "02/27/92", "01/14/92",
"02/28/92", "02/01/92")
> max <-as.Date(dates, "%m/%d/%y")
> max
[1] "1992-02-27" "1992-02-27" "1992-01-14"
"1992-02-28" "1992-02-01"
> class(max)
[1] "Date"


My example

cc <- c("2005/01/24" ,"2006/01/23" ,"2006/01/23",
"2006/01/23")
xx <- as.Date(cc, "%y/%m/%d")
xx
class(xx)

Results
> cc <- c("2005/01/24" ,"2006/01/23" ,"2006/01/23",
"2006/01/23")
> xx <- as.Date(cc, "%y/%m/%d")
> xx
[1] NA NA NA NA
> class(xx)
[1] "Date"

And on to the cbind problem

jj <- 1:5
cbind(jj,max)

   jj  max
[1,]  1 8092
[2,]  2 8092
[3,]  3 8048
[4,]  4 8093
[5,]  5 8066

I have tried various as.Date etc approcaes

It is probably something blindingly simple but can
anyone suggest something?

Thanks