[R] Replace / with - in date

[prem_R]

>  x <- c("2000/01/01",
"2001/02/01","2000/03/01","2000/04/01","2000/05/01","2000/06/01","2000/07/01","2000/08/01","2000/09/01","2000/10/01")
>  xd <- as.data.frame(x)
>  levels(xd$x) <- gsub("/", "-", levels(xd$x)) 
>  fix(xd)

This works fine .but with one more variable say xsd in the data frame i'm
getting the following error


Error in levels(sa$date1) <- gsub("/", "-", levels(sa$date)) : 
  attempt to set an attribute on NULL

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