jQuery Date Picker - disable past dates

You must create a new date object and set it as minDate when you initialize the datepickers

<label for="from">From</label> <input type="text" id="from" name="from"/> <label for="to">to</label> <input type="text" id="to" name="to"/>

var dateToday = new Date();
var dates = $("#from, #to").datepicker({
    defaultDate: "+1w",
    changeMonth: true,
    numberOfMonths: 3,
    minDate: dateToday,
    onSelect: function(selectedDate) {
        var option = this.id == "from" ? "minDate" : "maxDate",
            instance = $(this).data("datepicker"),
            date = $.datepicker.parseDate(instance.settings.dateFormat || $.datepicker._defaults.dateFormat, selectedDate, instance.settings);
        dates.not(this).datepicker("option", option, date);
    }
});

Edit - from your comment now it works as expected http://jsfiddle.net/nicolapeluchetti/dAyzq/1/

Declare dateToday variable and use Date() function to set it.. then use that variable to assign to minDate which is parameter of datepicker.

var dateToday = new Date(); 
$(function() {
    $( "#datepicker" ).datepicker({
        numberOfMonths: 3,
        showButtonPanel: true,
        minDate: dateToday
    });
});

That's it... Above answer was really helpful... keep it up guys..