js現在時間(yyy-mm-dd hh:mm:ss)を取得する方法

function getTime(){
    var date = new Date();
    var seperator1 = "-";
    var seperator2 = ":";
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    if (month >= 1 && month <= 9) {
        month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    var currentdate = date.getFullYear() + seperator1 + month +     seperator1 + strDate + " " + date.getHours() + seperator2 + date.getMinutes()+ seperator2 + date.getSeconds();
    return currentdate;
}
console.log(getTime());//2017-08-04 11:33:13