code: func adjustYear(y int) int {
  	if y >= 0 && y <= 69 {
  		y = 2000 + y
  	} else if y >= 70 && y <= 99 {
  		y = 1900 + y
  	}
  	return y
  }
docs: // adjustYear adjusts year according to y.
  // See https://dev.mysql.com/doc/refman/5.7/en/two-digit-years.html