code: func dayOfMonthWithSuffix(t *mysqlTime, input string, ctx map[string]int) (string, bool) {
  	month, remain := parseOrdinalNumbers(input)
  	if month >= 0 {
  		t.month = uint8(month)
  		return remain, true
  	}
  	return input, false
  }
docs: // 0th 1st 2nd 3rd ...