time - 获取 time.Time 月份的最后一天

Question

当我有一个time.Time时:

// January, 29th
t, _ := time.Parse("2006-01-02", "2016-01-29")

如何获得代表 1 月 31 日的 time.Time？这个例子很简单，但是当日期在二月时，最后一天可能是 28 日或 29 日。

Answer 1

Package time

func Date

func Date(year int, month Month, day, hour, min, sec, nsec int, loc *Location) Time

Date returns the Time corresponding to

yyyy-mm-dd hh:mm:ss + nsec nanoseconds

in the appropriate zone for that time in the given location.

The month, day, hour, min, sec, and nsec values may be outside their usual ranges and will be normalized during the conversion. For example, October 32 converts to November 1.

例如，规范化一个日期，

package main

import (
    "fmt"
    "time"
)

func main() {
    // January, 29th
    t, _ := time.Parse("2006-01-02", "2016-01-29")
    fmt.Println(t.Date())
    // January, 31st
    y,m,_ := t.Date()
    lastday:= time.Date(y,m+1,0,0,0,0,0,time.UTC)
    fmt.Println(lastday.Date())
}

输出:

2016 January 29
2016 January 31