Twitter search for my recent tweets

Question

Has twitter search stopped supporting this:

from:username since:2010-05-01

It used to work!

The reason I care is I use the following javascript to display recent tweets on my webpage

var username = '...'
var od = new Date();
od.setMilliseconds( od.getMilliseconds() - 518400000 );
var month = od.getMonth() + 1
if (month<10) month = ('0'+month)
var day = od.getDate()
if (day<10) day = ('0'+day)
var year = od.getFullYear()
var sd = (year + '-' + month + '-' + day)
document.write( sd )
new TWTR.Widget({
  search: 'from:' + username + ' since:' + sd,

This has worked for about a year, but recently stopped.