golang get day of week

Title: Golang Gets Day of the Week - Easily Process Date and Time

With the development of Internet technology, the processing of time and date information has become an essential part of our life and work. How to use computers Programming to process time and date data has become one of the problems that everyone often faces. In this article, we will introduce how to use the golang programming language to get the day of the week the current date is.

1. What is time and date

Time refers to any moment, usually expressed as hours, minutes, and seconds, such as "12:30:45". Date refers to the current day of a certain day or period of time, usually including year, month, day and other information, such as "November 10, 2021".

In computers, time and dates are usually stored as a long integer number, which represents the number of seconds that have passed since 0:00:00 on January 1, 1970 AD (called a UNIX timestamp) , you can subtract the initial value from the current time to get the timestamp of the current time. For example, in golang, you can use the following code to get the current timestamp:

now := time.Now().Unix() // 获取当前时间戳

2. Date and time library in golang

Golang provides the time package for processing dates, times, and timestamps and other related information. This library contains many functions and variables that can easily implement some complex date and time operations. For example:

1. Get the current time

now := time.Now() // 返回当前时间

2. Format time

now := time.Now()
fmt.Println(now.Format("2006-01-02 15:04:05")) // 输出格式化后的时间

3. Time stamp conversion

timestamp := 1636536737
t := time.Unix(timestamp, 0)
fmt.Println(t) // 输出时间戳对应的时间

4. Time addition and subtraction

now := time.Now()
oneHourLater := now.Add(time.Hour * 1) // 当前时间加上1小时

3. Get the day of the week

In golang, you can use the Weekday() function to get the day of the week. This function returns an enumeration type value, representing Sunday to Saturday. For example, for the current time:

now := time.Now()
weekday := now.Weekday()

weekday’s value is the current day of the week, where the constant is defined as follows:

const (
    Sunday    Weekday = 0
    Monday            = 1
    Tuesday           = 2
    Wednesday         = 3
    Thursday          = 4
    Friday            = 5
    Saturday          = 6
)

Since the enumeration type is defined according to They are arranged in order starting from 0, that is, Sunday is 0, so the Weekday type can be directly converted to the int type to obtain the numerical representation of the day of the week:

weekday := int(now.Weekday())+1  // 转换为数字表示，从1开始

It is worth noting that in different countries and regions In China, the first day of the week may be different. For example, China generally defines Monday as the first day of the week, while in the United States, Sunday is generally defined as the first day of the week. In golang, you can use the WeekStartDay variable to specify the day of the week when the first day of the week is, and the default is Sunday.

// 将一周的第一天设置为周一
time.WeekStartDay = time.Monday

now := time.Now()
weekday := int(now.Weekday())+1

4. Complete program example

Finally, this article provides a complete code example for your reference:

package main

import (
    "fmt"
    "time"
)

func main() {
    // 获取当前时间
    now := time.Now()
    // 将一周的第一天设置为周一
    time.WeekStartDay = time.Monday
    // 获取当前时间是星期几
    weekday := int(now.Weekday())+1
    fmt.Printf("今天是星期%d
", weekday)
}

We can run the program in the terminal and get today's It's the day of the week information.

5. Summary

Using the time package in golang can easily handle date, time, timestamp and other related information. To get the day of the week the current time is, you can use the Weekday() function. By setting the WeekStartDay variable, you can specify the day of the week when the first day of the week is. In daily development, using the date and time library can avoid manual processing of time and date information and improve the readability and maintainability of the code.

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