Jquery 选择日期

<script type="text/javascript" charset="utf-8">
jQuery(function($){
    $.datepicker.regional['zh-CN'] = {    clearText: '清除', clearStatus: '清除已选日期',
                                        closeText: '关闭', closeStatus: '不改变当前选择',
                                        prevText: '&lt;上月', prevStatus: '显示上月',
                                        nextText: '下月&gt;', nextStatus: '显示下月',
                                        currentText: '今天', currentStatus: '显示本月',
                                        monthNames: ['一月','二月','三月','四月','五月','六月',
                                        '七月','八月','九月','十月','十一月','十二月'],
                                        monthNamesShort: ['一','二','三','四','五','六',
                                        '七','八','九','十','十一','十二'],
                                        monthStatus: '选择月份', yearStatus: '选择年份',
                                        weekHeader: '周', weekStatus: '年内周次',
                                        dayNames: ['星期日','星期一','星期二','星期三','星期四','星期五','星期六'],
                                        dayNamesShort: ['周日','周一','周二','周三','周四','周五','周六'],
                                        dayNamesMin: ['日','一','二','三','四','五','六'],
                                        dayStatus: '设置 DD 为一周起始', dateStatus: '选择 m月 d日, DD',
                                        dateFormat: 'yy-mm-dd', firstDay: 1, 
                                        changeMonth: true,changeYear: true,
                                        minDate: new Date(2009, 1 - 1, 1),duration: 'fast',showAnim:'fadeIn',
                                        initStatus: '请选择日期', isRTL: false};
                                        $.datepicker.setDefaults($.datepicker.regional['zh-CN']);
    $("#upgradedate").datepicker();
});

<input id="upgradedate" name="upgradedate" type="text">