英文:
golang time.Now().Unix() discrepancy between documentation and implementation?
问题
这是一个关于Go语言中时间包的问题。根据文档，time.Unix函数的签名是func Unix(sec int64, nsec int64) Time，意味着它返回一个Time对象。
但是下面的程序会中止，并显示错误信息：
>14: cannot use now.Unix() (type int64) as type time.Time in assignment`
func main() {
var now time.Time
now = time.Now()
fmt.Println(now)
var secs time.Time
secs = now.Unix()
fmt.Println(secs)
}
下面这个版本的程序会输出：
func main() {
var now time.Time
now = time.Now()
fmt.Println(now)
// var secs time.Time
secs := now.Unix()
fmt.Println(secs)
}
输出结果为：
2016-04-12 18:20:22.566965512 -0400 EDT
1460499622
这只是文档中的错误吗？
英文:
https://golang.org/pkg/time/#Unix
states that the signature of this function is
func Unix(sec int64, nsec int64) Time
meaning, it returns a Time object.
But the following program aborts with the error message:
>14: cannot use now.Unix() (type int64) as type time.Time in assignment`
func main() {
var now time.Time
now = time.Now()
fmt.Println(now)
var secs time.Time
secs = now.Unix()
fmt.Println(secs)
}
The following version of the program produces output
func main() {
var now time.Time
now = time.Now()
fmt.Println(now)
// var secs time.Time
secs := now.Unix()
fmt.Println(secs)
}
2016-04-12 18:20:22.566965512 -0400 EDT
1460499622
Is this just a matter of error in documentation?
答案1
得分: 5
文档是正确的，你正在查看错误版本的Unix。你正在使用的方法是这个：https://golang.org/pkg/time/#Time.Unix 它不接受任何参数，是在时间对象上调用的，并将Unix时间作为int64返回。你引用的版本接受两个参数，都是int64类型的，秒和纳秒？（不确定nseconds代表什么）它表示Unix格式的时间，并返回一个time.Time对象。
所以，为了扩展你的第二个示例：
func main() {
var now time.Time
now = time.Now()
fmt.Println(now)
// var secs time.Time
secs := now.Unix()
fmt.Println(secs)
t := time.Unix(secs, 0) // 从秒值获取一个Unix时间的时间
fmt.Println(t)
}
在上面的示例中，我添加了一行代码来打印secs的类型。你可以在这里查看它的运行结果：https://play.golang.org/p/KksPPbQ1Jy
英文:
The docs are correct, you're looking at the wrong version of Unix. The method you're using is this; https://golang.org/pkg/time/#Time.Unix it takes no arguments, is called on a time object and returns the unix time as an int64. The version you're referencing takes two arguments, both int64's, the seconds and nanoseconds? (not positive that's what the nseconds stands for) which represent a time in unix format and it returns a time.Time
So to extend your second example;
func main() {
var now time.Time
now = time.Now()
fmt.Println(now)
// var secs time.Time
secs := now.Unix()
fmt.Println(secs)
t := time.Unix(secs, 0) // get a time from the seconds value which is a unix time
fmt.Println(t)
}
Here's the above in play with one other line added to print the type of secs. https://play.golang.org/p/KksPPbQ1Jy
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