Use of time processing library in Go language

In software development, processing time is a recurring issue. Especially in large systems, time is an essential part of recording events, scheduling tasks, and analyzing data. Therefore, using a suitable time processing library becomes a very important task. This article will introduce the use of time processing library time in Go language.

Representation of time

In the Go language, we can use the time.Time type to represent time. A value of type Time contains year, month, day, hour, minute, second, nanosecond and time zone information. This type is built-in so we don't need to install any additional libraries to use it.

Get the current time

The method to get the current local time is to use the time.Now() function. It will return a time object of type time.Time, which represents the current time when the program is running.

func main() {
    current_time := time.Now()
    fmt.Println(current_time)
}

Output results:

2021-05-17 16:34:22.7241986 +0800 CST m=+0.000731901

Time formatting

It is a very common requirement to display time in different formats. In the Go language, we can use the time.Format() function to format time. This function receives a format string and converts the time object into the corresponding string according to this format.

func main() {
    current_time := time.Now()
    formatted_time := current_time.Format("2006-01-02 15:04:05")
    fmt.Println(formatted_time)
}

Output result:

2021-05-17 16:34:22

In the format string, several commonly used placeholders are as follows:

# to the left. is fixed as a 2-digit date. If there are less than 2 digits, add 0 Fixed to 2 digits of hour, 24-hour system, if there are less than two digits, add 0 on the left side Fixed to 2 For minutes with 2 digits, add 0 to the left if there are less than two digits.##Time operation

Placeholder The symbol	means
2006	is fixed to a 4-digit year, indicating a Standard
01	is fixed to a 2-digit month. If there are less than 2 digits, add 0
##02
15
04
05

The time processing library of Go language also provides some time operation methods.

Increase or decrease the duration

time.Add()

The method allows us to add or reduce a period of time:<pre class='brush:go;toolbar:false;'>func main() { current_time := time.Now() after_one_hour := current_time.Add(time.Hour) fmt.Println(after_one_hour) }</pre>Output result:

2021-05-17 17:34:22.6523704 +0800 CST m=+3601.928903701

In this example, we use

time.Hour

to represent the length of one hour, and then use the Add() method to add the current time to this length of time. The return value of this method is a time object, which represents the time point one hour after the current time. We can also use the

time.Sub()

method to calculate the time difference between two times: <pre class='brush:go;toolbar:false;'>func main() { start_time := time.Now() end_time := time.Now().Add(time.Hour) duration := end_time.Sub(start_time) fmt.Println(duration) }</pre>Output result:

1h0m0s

here The calculation result is a value of type

time.Duration

, which represents the length of time between two time points. Set time

time.Date()

method allows us to create a time object based on the specified year, month, day, hour, minute, second and time zone: <pre class='brush:go;toolbar:false;'>func main() { t := time.Date(2021, 5, 17, 15, 30, 0, 0, time.Local) fmt.Println(t) }</pre>Output result:

2021-05-17 15:30:00 +0800 CST

Get time information

Time

type provides some methods to get time information, such as year, month, day , hours, minutes, seconds, etc. The following are some commonly used methods: <pre class='brush:go;toolbar:false;'>func main() { current_time := time.Now() fmt.Println(current_time.Year()) // 获取年份 fmt.Println(current_time.Month()) // 获取月份 fmt.Println(current_time.Day()) // 获取日期 fmt.Println(current_time.Hour()) // 获取小时数 fmt.Println(current_time.Minute()) // 获取分钟数 fmt.Println(current_time.Second()) // 获取秒数 fmt.Println(current_time.Weekday()) // 获取星期几，0表示星期日 }</pre>Output results:

2021
May
17
16
34
22
Monday

Reference documentation

[Go language official documentation](https://golang.org/ pkg/time/)

• [Usage of Golang time and date](https://www.runoob.com/w3cnote/go-datetime.html)

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