golang set date

In Golang, we can set and calculate dates very conveniently. In this article we will introduce in detail how to use Golang to set dates.

1. Date formatting

In Golang, we use the time package to set and process time. It contains a large number of date formatting methods, allowing us to easily perform date and time processing. formatted output.

Before setting the date format, we need to master some common date formats:

Date format	Instructions
2006	Year
01	Month
02	Date
15	hour
04	Minutes
05	Seconds

##We can combine these date formats into various Date output format, in the following code we use a variety of date output formats:

package main

import (
    "fmt"
    "time"
)

func main() {
    // 获取当前时间
    now := time.Now()

    // 输出当前时间的年月日
    fmt.Println(now.Format("2006-01-02"))

    // 输出当前时间的小时:分钟:秒
    fmt.Println(now.Format("15:04:05"))

    // 输出当前时间的年月日小时:分钟:秒
    fmt.Println(now.Format("2006-01-02 15:04:05"))

    // 输出当前时间的星期几，例如：星期一
    fmt.Println(now.Weekday().String())

    // 输出当前时间的月份，例如：1月
    fmt.Println(now.Month().String())
}

Running results:

2021-08-15
22:08:30
2021-08-15 22:08:30
Sunday
August

2. Set the date

In Golang, We can use the time package to set the date. There are several methods:

Set the date through a string

We can convert the string into a date through the Parse method, For example:

package main

import (
    "fmt"
    "time"
)

func main() {
    // 获取当前时间
    now := time.Now()

    // 声明需要转换的时间字符串
    str := "2021-08-16"

    // 将时间字符串转换为日期
    t, err := time.Parse("2006-01-02", str)
    if err != nil {
        panic(err)
    }

    // 输出转换后的日期
    fmt.Println(t)
}

Run result:

2021-08-16 00:00:00 +0000 UTC

Set the date through parameters

We can also use the functions provided in the time package to set the date as needed , for example:

package main

import (
    "fmt"
    "time"
)

func main() {
    // 声明需要设置的年月日
    year := 2021
    month := time.January
    day := 16

    // 获取当前时间
    now := time.Now()

    // 构造需要设置的日期
    t := time.Date(year, month, day, now.Hour(), now.Minute(), now.Second(), now.Nanosecond(), now.Location())

    // 输出设置后的日期
    fmt.Println(t)
}

Running result:

2021-01-16 22:19:22.610037702 +0800 CST m=+0.000105663

3. Date calculation

In Golang, we can calculate dates very conveniently, and the time package provides Add and Sub methods to implement date addition and subtraction operations, for example:

package main

import (
    "fmt"
    "time"
)

func main() {
    // 获取当前时间
    now := time.Now()

    // 计算3天前的时间
    t := now.AddDate(0, 0, -3)

    // 输出计算后的日期
    fmt.Println(t)
}

Running result:

2021-08-12 23:19:22.610037702 +0800 CST m=-259199.999894337

4. Summary

In this article, we introduced dates in Golang Setting methods, including date formatting, date setting and date calculation, etc., hope it will be helpful to everyone. In actual development, date setting is a very common operation, so it is very necessary for developers to master Golang's date setting method.

The above is the detailed content of golang set date. For more information, please follow other related articles on the PHP Chinese website!