ios - cannot invoke 'stringFromDate' error in swift -


i'm trying simple date format in swift i'm getting following error:

"cannot invoke 'stringfromdate' argument list of type '(nsdate?!)'"

my code follows:

override func tableview(tableview: uitableview, cellforrowatindexpath       indexpath: nsindexpath) -> uitableviewcell {      let cell = tableview.dequeuereusablecellwithidentifier("cell",       forindexpath: indexpath) as! uitableviewcell      // configure cell...      let dateformatter = nsdateformatter()      dateformatter.dateformat = ("dd-mmm-yyyy")      var myusers: anyobject = users[indexpath.row]      let strdate = dateformatter.stringfromdate(myusers.createdat)       return cell }

}

does know why can't in swift? have used method before , worked fine. have searched other answers haven't found suitable.

appreciate available. many thanks

check following code:

    var dateformatter = nsdateformatter()     dateformatter.dateformat = "yyyy-mm-dd"     let d = nsdate()     let s = dateformatter.stringfromdate(d)     println(s)

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