2018-07-10 09:35:3910
2018-07-10 09:35:49

I have tried as follow : -

    Mydate := 2018-07-10 09:35:39
    layout := "2006-01-02 15:04:05"
    Seconds := 10
    MydateParse, _ := time.Parse(layout, Mydate)
    FinalDate := MydateParse.Add(time.Second * Seconds)