在 Go 语言中，时间包提供了确定和查看时间的功能。 Go 语言中的Time.YearDay()函数用于查找“t”提供的一年中的哪一天。其中，非闰年的范围为 [1, 365]，闰年的范围为 [1, 366]。而且，这个函数是在time包下定义的。在这里，您需要导入“time”包才能使用这些功能。
Syntax:
Here, “t” is the stated time.
Return value: It returns the day of the year as specified by “t”.
示例 1：
func (t Time) YearDay() int
输出：
// Golang program to illustrate the usage of
// Time.YearDay() function
// Including main package
package main
// Importing fmt and time
import "fmt"
import "time"
// Calling main
func main() {
// Declaring t in UTC
t := time.Date(2019, 6, 5, 11,
35, 04, 0, time.UTC)
// Calling YearDay method
yrday := t.YearDay()
// Prints the day
// of the year as specified
fmt.Printf("The day of the year "+
"in the 't' specified is: %v\n", yrday)
}
示例 2：
The day of the year in the 't' specified is: 156
输出：
// Golang program to illustrate the usage of
// Time.YearDay() function
// Including main package
package main
// Importing fmt and time
import "fmt"
import "time"
// Calling main
func main() {
// Declaring t in UTC
t := time.Date(2020, 35, 60,
45, 67, 94, 7567, time.UTC)
// Calling YearDay method
yrday := t.YearDay()
// Prints the day of the year as specified
fmt.Printf("The day of the year in "+
"the 't' specified is: %v\n", yrday)
}
此处，上述“t”具有超出通常范围的值，但它们在转换时被归一化。