<script src="http://yui.yahooapis.com/3.1.0/build/yui/yui-min.js"></script>

YUI({
    //Last Gallery Build of this module
    gallery: 'gallery-2010.02.25-22'
}).use('gallery-timepicker', function(Y) {
 
 var picker = new Y.Saw.Timepicker({contentBox: '#cb'}); //assuming this exists
                picker.render();
 
                //hide
                picker.hide();
 
                //show
                picker.show();
 
                //set am or pm with class constants
                picker.set('time.ampm', picker.AM);
 
                //subscribe to events to do cool stuff:
                picker.subscribe('timeset', function(data){
                    //fires when the time changes
 
                    //put the 12 hour string into the input. s24hour is also available
                    Y.get('#time').set('value' ,data.s12hour); //#time should be a text input
 
                    //the data object also has members for hour, minute, ampm. Ampm is
                    //an int identified by picker.AM or picker.PM
                });
 
                picker.subscribe('cellclick', function(e){
                    //fires when a cell is clicked.
                   this.hide(); 
                },picker);
});