date problems in javascript[resolved]

[thebloke]

Something has occurred to me. I think if I could coerce the form field 'renewdate' into a javascript Date object then I should be able to manipulate it that way but I've tried:

var day = renewdate.substr(0,2)
var month = renewdate.substr(3,2)
var year = renewdate.substr(6,4)

var whenever = new Date(year,month,day)

alert(whenever);

But this returns:

Tue Nov......oh, hang on! I've cracked it!

Hooray (runs round office, arms aloft....like a loser)....