inaccurate time inside programs

func wait(duration time.Duration) {
        deadline := time.Now().Add(duration)

        for {
                now := time.Now()

                if now.After(deadline) {
                        break
                }

                time.Sleep(time.Minute)
                log.Printf("Left: %s", now.Sub(deadline))
        }
}

func main() {
    wait(time.Hour * 2)
}

func wait(duration time.Duration) {
        deadline := time.Now().Add(duration)

        for {
                now := time.Now()

                if now.After(deadline) {
                        break
                }

                time.Sleep(time.Minute)
                log.Printf("Left: %s", now.Sub(deadline))
        }
}

func main() {
    wait(time.Hour * 2)
}

func exec_date() time.Time {
  cmd := exec.Command("date", "+%s")

  stdout, err := cmd.Output()
  if err != nil {
    panic(err)
  }

  int, _ := strconv.ParseInt(
    string(stdout[:len(stdout)-1]), 10, 64)

  return time.Unix(int, 0)
}

func exec_date() time.Time {
  cmd := exec.Command("date", "+%s")

  stdout, err := cmd.Output()
  if err != nil {
    panic(err)
  }

  int, _ := strconv.ParseInt(
    string(stdout[:len(stdout)-1]), 10, 64)

  return time.Unix(int, 0)
}