function fmtDate(obj){
    if (obj != null) {
        var date = new Date(obj);
        var y = 1900 + date.getYear();
        var m = "0" + (date.getMonth() + 1);
        var d = "0" + date.getDate();
        return y + "-" + m.substring(m.length - 2, m.length) + "-" + d.substring(d.length - 2, d.length);
    }
}


function fmtDate2(obj){
    if (obj != null) {
        var date = new Date(obj);
        var y = 1900 + date.getYear();
        var m = "0" + (date.getMonth() + 1);
        var d = "0" + date.getDate();
        return y + "/" + m.substring(m.length - 2, m.length) + "/" + d.substring(d.length - 2, d.length);
    }
}

Date.prototype.format = function(fmt) {
    var o = {
        "M+" : this.getMonth()+1,                 //月份
        "d+" : this.getDate(),                    //日
        "h+" : this.getHours(),                   //小时
        "m+" : this.getMinutes(),                 //分
        "s+" : this.getSeconds(),                 //秒
        "q+" : Math.floor((this.getMonth()+3)/3), //季度
        "S"  : this.getMilliseconds()             //毫秒
    };
    if(/(y+)/.test(fmt)) {
        fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));
    }
    for(var k in o) {
        if(new RegExp("("+ k +")").test(fmt)){
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
        }
    }
    return fmt;
}