我怎么能在Javascript中获得秒?

On Unix, I can run date '+%s' to get the amount of seconds since epoch. But I need to query that in a browser front-end, not back-end.

在Unix上，我可以运行date '+%s'来获得从epoch起的秒数。但是我需要在浏览器前端而不是后端进行查询。

Is there a way to find out seconds since Epoch in JavaScript?

是否有一种方法可以在JavaScript内找到时间?

7 个解决方案

#1

169

var seconds = new Date() / 1000;

Or, for a less hacky version:

或者，为了一个不那么陈腐的版本:

var d = new Date();
var seconds = d.getTime() / 1000;

Don't forget to Math.floor() or Math.round() to round to nearest whole number or you might get a very odd decimal that you don't want:

不要忘记用Math.floor()或Math.round()来表示最接近的整数，否则你可能会得到一个你不想要的非常奇怪的小数:

var d = new Date();
var seconds = Math.round(d.getTime() / 1000);

#2

Try this:

试试这个:

new Date().getTime() / 1000

You might want to use Math.floor() or Math.round() to cut milliseconds fraction.

您可能需要使用Math.floor()或Math.round()来减少毫秒数。

#3

You wanted seconds since epoch

你想要几秒钟的时间

function seconds_since_epoch(){ return Math.floor( Date.now() / 1000 ) }

example use

示例使用

foo = seconds_since_epoch();

#4

The above solutions use instance properties. Another way is to use the class property Date.now:

上述解决方案使用实例属性。另一种方法是使用类属性数据。

var time_in_millis = Date.now();
var time_in_seconds = time_in_millis / 1000;

If you want time_in_seconds to be an integer you have 2 options:

如果您希望time_in_seconds是整数，您有两个选项:

a. If you want to be consistent with C style truncation:

a.如果您希望与C风格的截断保持一致:

time_in_seconds_int = time_in_seconds >= 0 ?
                      Math.floor(time_in_seconds) : Math.ceil(time_in_seconds);

b. If you want to just have the mathematical definition of integer division to hold, just take the floor. (Python's integer division does this).

b.如果你想要有整数除法的数学定义，只要在地板上。(Python的整数除法就是这么做的)。

time_in_seconds_int = Math.floor(time_in_seconds);

#5

If you want only seconds as a whole number without the decimals representing milliseconds still attached, use this:

如果你只需要数秒作为一个整数，而没有代表毫秒的小数，可以用这个:

var seconds = Math.floor(new Date() / 1000);

#6

You can create a Date object (which will have the current time in it) and then call getTime() to get the ms since epoch.

您可以创建一个Date对象(其中将包含当前时间)，然后调用getTime()来获取自纪元以来的ms。

var ms = new Date().getTime();

If you want seconds, then divide it by 1000:

如果你想要秒，那么除以1000:

var sec = new Date().getTime() / 1000;

#7

My preferred way:

我的首选方法:

var msEpoch = (+new Date());
var sEpoch = (+new Date()) / 1000;

For more information on the + jump down the rabbit hole.

要了解更多关于+跳越兔子洞的信息。

#1

169

var seconds = new Date() / 1000;