blocks|key|1130246|text|var+seconds+=+new+Date().getTime()+/+1000;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1130247|....will提供了自1970年1月1日午夜以来的秒数|unstyled|1130248|Reference|offset|length|1130249|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3schools.com/jsref/jsref_obj_date.asp^0|0|0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|F|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<pre><code>var seconds = new Date().getTime() / 1000;
</code></pre>

....will give you the seconds since midnight, 1 Jan 1970

<a href="http://www.w3schools.com/jsref/jsref_obj_date.asp" rel="noreferrer">Reference</a>

blocks|key|1130329|text|+Date.now()|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1130330|给出从纪元开始的毫秒数。不需要使用new。|unstyled|offset|length|style|CODE|1130331|在这里查看参考资料：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now|1130332|(IE8中不支持。)|1130333|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now^0|0|H|3|0|A|2H|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|X|8|@$G|Y|H|Z|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@$G|11|H|12|1|13]]|A|$]]|$1|M|3|N|5|F|7|14|8|@]|9|@]|A|$]]|$1|O|3|-4|5|F|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

<pre><code> Date.now()
</code></pre>

gives milliseconds since epoch. No need to use <code>new</code>. 

Check out the reference here: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now</a>

(Not supported in IE8.)

blocks|key|1130148|text|根据你的评论，我认为你正在寻找这样的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1130149|var+timeout+=+new+Date().getTime()+%2B+15*60*1000;+//add+15+minutes;|code-block|syntax|javascript|1130150|然后在你的检查中，你会检查：|1130151|if(new+Date().getTime()+>+timeout)+{
++alert("Session+has+expired");
}|1130152|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Based on your comment, I think you're looking for something like this:

<pre><code>var timeout = new Date().getTime() + 15*60*1000; //add 15 minutes;
</code></pre>

Then in your check, you're checking:

<pre><code>if(new Date().getTime() &gt; timeout) {
 alert("Session has expired");
}
</code></pre>

blocks|key|1130280|text|要从Javascript纪元中获取秒数，请使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1130281|date+=+new+Date();
milliseconds+=+date.getTime();
seconds+=+milliseconds+/+1000;|code-block|syntax|javascript|1130282|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To get the number of seconds from the Javascript epoch use:

<pre><code>date = new Date();
milliseconds = date.getTime();
seconds = milliseconds / 1000;
</code></pre>

blocks|key|1130648|text|我使用的是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1130649|Math.round(Date.now()+/+1000)|code-block|syntax|javascript|1130650|不需要创建新对象(参见doc+Date.now())|offset|length|1130651|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now^0|0|0|B|E|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I use this:
<pre><code>Math.round(Date.now() / 1000)
</code></pre>
No need for new object creation (see <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now" rel="noreferrer">doc Date.now()</a>)

blocks|key|915750|text|这些JavaScript解决方案为您提供自1970年1月1日午夜以来的毫秒或秒数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|915751|IE+9%2B解决方案(IE+8或更早的版本不支持此功能。)：|915752|var+timestampInMilliseconds+=+Date.now();
var+timestampInSeconds+=+Date.now()+/+1000;+//+A+float+value;+not+an+integer.
++++timestampInSeconds+=+Math.floor(Date.now()+/+1000);+//+Floor+it+to+get+the+seconds.
++++timestampInSeconds+=+Date.now()+/+1000+%7C+0;+//+Also+you+can+do+floor+it+like+this.
++++timestampInSeconds+=+Math.round(Date.now()+/+1000);+//+Round+it+to+get+the+seconds.|code-block|syntax|javascript|915753|要获取有关Date.now()的更多信息，请访问：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now|offset|length|style|CODE|915754|通用解决方案：|915755|//+‘%2B’+operator+makes+the+operand+numeric.
//+And+‘new’+operator+can+be+used+without+the+arguments+‘(……)’.
var+timestampInMilliseconds+=+%2Bnew+Date;
var+timestampInSeconds+=+%2Bnew+Date+/+1000;+//+A+float+value;+not+an+intger.
++++timestampInSeconds+=+Math.floor(%2Bnew+Date+/+1000);+//+Floor+it+to+get+the+seconds.
++++timestampInSeconds+=+%2Bnew+Date+/+1000+%7C+0;+//+Also+you+can+do+floor+it+like+this.
++++timestampInSeconds+=+Math.round(%2Bnew+Date+/+1000);+//+Round+it+to+get+the+seconds.|915756|如果你不想要这样的东西，使用时要小心。|915757|if(1000000+<+Math.round(1000000.2))+//+false.|915758|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now^0|0|0|0|5|A|P|2H|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|17|8|@$K|18|L|19|M|N]]|9|@$K|1A|L|1B|1|1C]]|A|$]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|1E|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|1F|8|@]|9|@]|A|$]]|$1|U|3|V|5|F|7|1G|8|@]|9|@]|A|$G|H]]|$1|W|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

These JavaScript solutions give you the milliseconds or the seconds since the midnight, January 1st, 1970.

The IE 9+ solution(IE 8 or the older version doesn't support this.):

<pre><code>var timestampInMilliseconds = Date.now();
var timestampInSeconds = Date.now() / 1000; // A float value; not an integer.
 timestampInSeconds = Math.floor(Date.now() / 1000); // Floor it to get the seconds.
 timestampInSeconds = Date.now() / 1000 | 0; // Also you can do floor it like this.
 timestampInSeconds = Math.round(Date.now() / 1000); // Round it to get the seconds.
</code></pre>

To get more information about <code>Date.now()</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now" rel="noreferrer">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now</a>

The generic solution:

<pre><code>// ‘+’ operator makes the operand numeric.
// And ‘new’ operator can be used without the arguments ‘(……)’.
var timestampInMilliseconds = +new Date;
var timestampInSeconds = +new Date / 1000; // A float value; not an intger.
 timestampInSeconds = Math.floor(+new Date / 1000); // Floor it to get the seconds.
 timestampInSeconds = +new Date / 1000 | 0; // Also you can do floor it like this.
 timestampInSeconds = Math.round(+new Date / 1000); // Round it to get the seconds.
</code></pre>

Be careful to use, if you don't want something like this case.

<pre><code>if(1000000 &lt; Math.round(1000000.2)) // false.
</code></pre>

blocks|key|1130544|text|Date.now()-Math.floor(Date.now()/1000/60/60/24)*24*60*60*1000|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1130545|这应该给你从一天开始的毫秒数。|unstyled|1130546|(Date.now()-Math.floor(Date.now()/1000/60/60/24)*24*60*60*1000)/1000|1130547|这应该给你几秒钟的时间。|1130548|(Date.now()-(Date.now()/1000/60/60/24%7C0)*24*60*60*1000)/1000|1130549|除了使用按位运算符来表示天数之外，与前面的相同。|1130550|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|F|7|W|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>Date.now()-Math.floor(Date.now()/1000/60/60/24)*24*60*60*1000
</code></pre>

This should give you the milliseconds from the beginning of the day.

<pre><code>(Date.now()-Math.floor(Date.now()/1000/60/60/24)*24*60*60*1000)/1000
</code></pre>

This should give you seconds.

<pre><code>(Date.now()-(Date.now()/1000/60/60/24|0)*24*60*60*1000)/1000
</code></pre>

Same as previous except uses a bitwise operator to floor the amount of days.

blocks|key|1130404|text|自1970年1月1日以来，您可以遇到另一种以秒/毫秒为单位获取时间的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1130405|var+milliseconds+=+%2Bnew+Date;++++++++
var+seconds+=+milliseconds+/+1000;|code-block|syntax|javascript|1130406|但是要小心使用这种方法，因为它可能很难阅读和理解。|1130407|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can met another way to get time in seconds/milliseconds since 1 Jan 1970:

<pre><code>var milliseconds = +new Date; 
var seconds = milliseconds / 1000;
</code></pre>

But be careful with such approach, cause it might be tricky to read and understand it.

blocks|key|915707|text|更好的捷径：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|915708|%2Bnew+Date+#+Milliseconds+since+Linux+epoch
%2Bnew+Date+/+1000+#+Seconds+since+Linux+epoch
Math.round(%2Bnew+Date+/+1000)+#Seconds+without+decimals+since+Linux+epoch|code-block|syntax|javascript|915709|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Better short cuts:

<pre><code>+new Date # Milliseconds since Linux epoch
+new Date / 1000 # Seconds since Linux epoch
Math.round(+new Date / 1000) #Seconds without decimals since Linux epoch
</code></pre>

blocks|key|1130617|text|在2020年的某一天，在Chrome80.0.3987.132中，这给了1584533105|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1130618|~~(new+Date()/1000)+//+1584533105
Number.isInteger(~~(new+Date()/1000))+//+true|code-block|syntax|javascript|1130619|entityMap^0|10|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

On some day in 2020, inside Chrome 80.0.3987.132, this gives <code>1584533105</code>

<pre><code>~~(new Date()/1000) // 1584533105
Number.isInteger(~~(new Date()/1000)) // true
</code></pre>

blocks|key|915833|text|要获取今天的总秒数，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|915834|getTodaysTotalSeconds(){
++++let+date+=+new+Date();++++++++
++++return+%2B(date.getHours()+*+60+*+60)+%2B+(date.getMinutes()+*+60)+%2B+date.getSeconds();
}|code-block|syntax|javascript|915835|我在返回中添加了int中返回的%2B。这可能会对其他开发人员有所帮助。:)|offset|length|style|CODE|915836|entityMap^0|0|0|8|3|F|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

To get today's total seconds of the day:
<pre><code>getTodaysTotalSeconds(){
 let date = new Date(); 
 return +(date.getHours() * 60 * 60) + (date.getMinutes() * 60) + date.getSeconds();
}
</code></pre>
I have add <code>+</code> in return which return in <code>int</code>. This may help to other developers. :)

blocks|key|915914|text|如果你只需要三个JS中的几秒，那么在函数中使用下面的代码之一使用window.requestAnimationFrame()|type|unstyled|depth|inlineStyleRanges|entityRanges|data|915915|let+sec+=+parseInt(Date.now().toString()[10]);+console.log('+counting+Seconds+=>+'%2B+sec+);|offset|length|style|CODE|915916|或let+currentTime=+Date.now();|915917|let+secAsString=+time.toString()[10];|915918|let+sec+=+parseInt(t);|915919|console.log('counting+Seconds+=>'%2B+sec+);|915920|entityMap^0|0|0|2I|0|1|S|0|0|11|0|0|M|0|0|15|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|N|3|O|5|6|7|14|8|@$D|15|E|16|F|G]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|Q|$]]

if you simply need seconds in THREE JS, use one of the code bellow in function uses window.requestAnimationFrame()
<code>let sec = parseInt(Date.now().toString()[10]); console.log(' counting Seconds =&gt; '+ sec );</code>
or
<code>let currentTime= Date.now();</code>
<code>let secAsString= time.toString()[10];</code>
<code>let sec = parseInt(t);</code>
<code>console.log('counting Seconds =&gt;'+ sec );</code>

How do I get the current date/time in seconds in Javascript?

Get current date/time in seconds

如何在Javascript中获取以秒为单位的当前日期/时间？

问获取当前日期/时间(秒)
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