function dateFormat(format) {
    var date = new Date();
    var format_arr = {
        "Y": date.getFullYear(),
        "m": date.getMonth() + 1 >= 10 ? date.getMonth() + 1 : "0" + (date.getMonth() + 1),
        "d": date.getDate(),
        "H": date.getHours(),
        "i": date.getMinutes(),
        "s": date.getSeconds(),
    };
    for (var key in format_arr) {
        format = format.replace(key, format_arr[key]);
    }
    return format;
};

var now = dateFormat('Y-m-d H:i:s');
console.log(now);