var dt = new Date();
dt.getFullYear() + "/" + (dt.getMonth() + 1) + "/" + dt.getDate();
Since month index are 0 based you have to increment it by 1.
Edit
For a complete list of date object functions see
getMonth()
Returns the month (0-11) in the specified date according to local time.
getUTCMonth()
Returns the month (0-11) in the specified date according to universal time.