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 |
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 August2. 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
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
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=+0.0001056633. 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=-259199.9998943374. 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.
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