在 golang 中获取 3 年前的时间戳?

Get 3 years ago timestamp in golang?

我想获取3年前的time unix时间戳,我现在用这个:

time.Now().Unix(() - 3 * 3600 * 24 * 365

无论如何这都不太准确(因为一年可能有 366 天)。

直接用Time.AddDate()的方法就可以指定时间以年、月、日相加,如果想回溯也可以为负数:

AddDate() 方法声明:

func (t Time) AddDate(years int, months int, days int) Time

示例:

t := time.Now()
fmt.Println(t)
t2 := t.AddDate(-3, 0, 0)
fmt.Println(t2)

输出(在 Go Playground 上尝试):

2009-11-10 23:00:00 +0000 UTC
2006-11-10 23:00:00 +0000 UTC

也许你可以做到这一点

package main

import (
    "fmt"
    "time"
)

func timeShift(now time.Time, timeType string, shift int) time.Time {
    var shiftTime time.Time
    switch timeType {
    case "year":
        shiftTime = now.AddDate(shift, 0, 0)
    case "month":
        shiftTime = now.AddDate(0, shift, 0)
    case "day":
        shiftTime = now.AddDate(0, 0, shift)
    case "hour":
        shiftTime = now.Add(time.Hour * time.Duration(shift))
    case "minute":
        shiftTime = now.Add(time.Minute * time.Duration(shift))
    case "second":
        shiftTime = now.Add(time.Second * time.Duration(shift))
    default:
        shiftTime = now
    }
    return shiftTime
}

func main(){
    d := time.Now().UTC()
    fmt.Println(timeShift(d, "month", 1))
    fmt.Println(timeShift(d, "day", -1))
    fmt.Println(timeShift(d, "hour", -1))
    fmt.Println(timeShift(d, "minute", -1))
    fmt.Println(timeShift(d, "second", -1))
}