Detailed explanation of how to use the time package in Golang

Golang, as a representative programming language in the mobile Internet era, has a unique implementation method in time processing. This article will introduce the time package in Golang and its implementation method.

time package

In Golang, we can perform time-related operations through the time package. The time package provides two ways of expressing time: time point (Time) and duration (Duration). A point in time represents a specific moment, while a duration represents a period of time, usually expressed in nanoseconds.

Commonly used functions in the time package

This article will introduce several commonly used functions, as follows:

1. func Now() Time

Function Now returns the current local time.

Code example:

package main
import (
    "fmt"
    "time"
)

func main() {
    now := time.Now()
    fmt.Println("当前时间：", now)
}

Output result:

当前时间： 2021-08-02 16:22:48.6399933 +0800 CST m=+0.004007201

2. func Sleep(d Duration)

Function Sleep can make the current The program "sleeps", that is, suspends execution for a period of time, and then resumes execution after waiting for the time to expire.

Code example:

package main
import (
    "fmt"
    "time"
)

func main() {
    fmt.Println("开始睡眠...")
    time.Sleep(2 * time.Second)
    fmt.Println("睡眠结束！")
}

Output result:

开始睡眠...
睡眠结束！

3. func Since(t Time) Duration

The function Since can calculate a certain The time difference from a time point to the present, the return value is of type Duration.

Code example:

package main
import (
    "fmt"
    "time"
)

func main() {
    t := time.Now().Add(-30 * time.Second)
    fmt.Println("30秒前的时间：", t)
    duration := time.Since(t)
    fmt.Println("时间差：", duration)
}

Output result:

30秒前的时间： 2021-08-02 16:28:42.440203 +0800 CST m=-30.004781101
时间差： 30.0072892s

4. func Parse(layout, value string) (Time, error)

Function Parse can convert a string into a time type. The parameter layout is a time format string, which is used to specify the format of the input time string. The parameter value is the string to be parsed.

Code example:

package main
import (
    "fmt"
    "time"
)

func main() {
    str := "2021-08-02 16:40:32"
    layout := "2006-01-02 15:04:05"
    t, _ := time.Parse(layout, str)
    fmt.Println("解析结果：", t)
}

Output result:

解析结果： 2021-08-02 16:40:32 +0000 UTC

5. func Format(t Time, layout string) string

Function Format is a function that formats the output of time t, where layout is a format string.

Code example:

package main
import (
    "fmt"
    "time"
)

func main() {
    t := time.Now()
    fmt.Println("当前时间：", t)
    layout := "2006年01月02日 15:04:05"
    fmt.Println("格式化后的时间：", t.Format(layout))
}

Output result:

当前时间： 2021-08-02 16:31:32.5976906 +0800 CST m=+0.013279501
格式化后的时间： 2021年08月02日 16:31:32

Summary

Golang’s time package provides developers with support for time processing. This article briefly introduces several commonly used functions, which can help everyone better understand how to use the time package. By becoming familiar with the time package, you can better handle time-related business logic.

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