jQuery UI: Date Picker

Date Picker

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/themes/mint-choc/jquery-ui.css">
    <input id="datepicker" type="text">

JavaScript

$("#datepicker" ).datepicker({  
    minDate: 0,
    beforeShowDay: function(d) {
            var day = d.getDate();
            return [(day == 5 || day == 10 || day == 15 || day == 20 || day == 25)];
    },
    beforeShow : function(){
        var dateTime = new Date();
        var hour = dateTime.getHours();
        var minute = dateTime.getMinutes();
        if(hour  >= 18 && minute > 30){
            $(this).datepicker( "option", "minDate", "1" );
        }
    }
});