Example analysis of how to set time in Go

Go language is a programming language mainly promoted by Google. It is characterized by simplicity, efficiency and security. In Go language, setting time is a very common operation. This article will introduce how to set time in Go.

1. Get the current time

In the Go language, use the Now function of the time package to get the current local time. The code example is as follows:

package main

import (
    "fmt"
    "time"
)

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

The output result is as follows:

当前时间: 2021-07-06 16:34:42.123456789 +0800 CST m=+0.000123456

As you can see, the output result contains the current year, month, day, hour, minute, second, nanosecond and other information.

2. Set time

In Go language, you can use the Time structure of the time package to represent time. This structure contains information such as year, month, day, hour, minute, second and nanosecond, and also contains a time zone information.

2.1 Set the time through the Time structure

You can set the time by setting the year, month, day, hour, minute, second and nanosecond information in the Time structure. The code example is as follows:

package main

import (
    "fmt"
    "time"
)

func main() {
    t := time.Date(2017, time.July, 18, 23, 30, 0, 0, time.Local)
    fmt.Println("设置的时间:", t)
}

The output result is as follows:

设置的时间: 2017-07-18 23:30:00 +0800 CST

You can see that the output result contains the set year, month, day, hour, minute, second and other information.

2.2 Setting the time through a string

In the Go language, you can set the time by parsing a string. The code example is as follows:

package main

import (
    "fmt"
    "time"
)

func main() {
    t, _ := time.Parse("2006-01-02 15:04:05", "2017-07-18 23:30:00")
    fmt.Println("设置的时间:", t)
}

The output result is as follows:

设置的时间: 2017-07-18 23:30:00 +0000 UTC

As you can see, the time zone in the output result is the UTC time zone. Because no time zone information is specified when parsing the string, the UTC time zone is used by default. You can specify the time zone used by setting the time zone information.

3. Set time zone

In Go language, you can use the LoadLocation function in the time package to load time zone information. At the same time, the method of the Time structure includes the In function, which can convert the time to the time in the specified time zone.

The code example is as follows:

package main

import (
    "fmt"
    "time"
)

func main() {
    loc, _ := time.LoadLocation("Asia/Shanghai")
    t, _ := time.ParseInLocation("2006-01-02 15:04:05", "2017-07-18 23:30:00", loc)
    fmt.Println("设置的时间（上海时区）:", t.In(loc))
}

The output result is as follows:

设置的时间（上海时区）: 2017-07-18 23:30:00 +0800 CST

As you can see, the time zone in the output result is Shanghai time zone.

4. Set the time interval

In the Go language, you can use the Duration type in the time package to represent the time interval. The time package also provides constants for various time intervals, such as Second, Minute, Hour, etc.

The code example is as follows:

package main

import (
    "fmt"
    "time"
)

func main() {
    t1 := time.Now()
    
    time.Sleep(2 * time.Second)
    
    t2 := time.Now()
    fmt.Println("时间间隔:", t2.Sub(t1))
}

The output result is as follows:

时间间隔: 2.000479239s

As you can see, the output result contains time interval information, accurate to the millisecond level.

Summary

This article introduces how to set the time in the Go language. You can set the time by setting the year, month, day, hour, minute, second and nanosecond information of the Time structure. , you can also set the time by parsing the string. At the same time, you can use the LoadLocation function to load time zone information, and use the In function to convert the time to the time in the specified time zone. The Go language also provides the Duration type to represent time intervals, which can be calculated through the Sub function.

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