type Month int

一年中的一个月

常量：

January Month = 1 + iota
February
March
April
May
June
July
August
September
October
November
December

代码实例：

package main

import (
	"fmt"
	"time"
)

func main() {
	_, m, _ := time.Now().Date()
	fmt.Println(m)
}