blocks|key|701679|text|您可以像在浏览器中一样执行此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|701680|​|701681|++++var+datetime+=+new+Date();
++++console.log(datetime);|code-block|syntax|javascript|701682|701683|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

You do that as you would in a browser:

<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code> var datetime = new Date();
 console.log(datetime);</code></pre>
</div>
</div>

blocks|key|701880|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|701881|++++var+datetime+=+new+Date();
++++console.log(datetime.toISOString().slice(0,10));|code-block|syntax|javascript|701882|701883|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|K|8|@]|9|@]|A|$E|F]]|$1|G|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|M|8|@]|9|@]|A|$]]]|I|$]]

<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code> var datetime = new Date();
 console.log(datetime.toISOString().slice(0,10));</code></pre>
</div>
</div>

blocks|key|486023|text|NodeJS+(和较新的浏览器)有一个很好的shortcut来获取以毫秒为单位的当前时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|486024|var+timeInMss+=+Date.now()|code-block|syntax|javascript|486025|与之相比，它有性能提升。|486026|var+timeInMss+=+new+Date().getTime()|486027|因为您不需要创建新对象。|486028|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now^0|M|8|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

NodeJS (and newer browsers) have a nice <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now" rel="noreferrer">shortcut</a> to get the current time in milliseconds. 

<pre><code>var timeInMss = Date.now()
</code></pre>

Which has a performance boost compared with 

<pre><code>var timeInMss = new Date().getTime()
</code></pre>

Because you do not need to create a new object.

blocks|key|701847|text|要在node.js或JavaScript中创建新的Date对象，只需调用它的初始值设定项|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|701848|var+d+=+new+Date();

var+d+=+new+Date(dateString);

var+d+=+new+Date(jsonDate);

var+d+=+new+Date(year,+month,+day);

var+d+=+new+Date(year,+month,+day,+hour,+minute,+second,+millisecond);|code-block|syntax|javascript|701849|请记住，Date对象只能通过调用Date或将其用作构造函数来实例化；与其他JavaScript对象类型不同，Date对象没有文字语法|701850|entityMap^0|2|7|A|A|0|0|G|4|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

To create a new Date object in <code>node.js</code>, or <code>JavaScript</code> in general, just call it’s initializer

<pre><code>var d = new Date();

var d = new Date(dateString);

var d = new Date(jsonDate);

var d = new Date(year, month, day);

var d = new Date(year, month, day, hour, minute, second, millisecond);
</code></pre>

Remember that Date objects can only be instantiated by calling <code>Date</code> or using it as a constructor; unlike other JavaScript object types, Date objects have no literal syntax

blocks|key|701624|text|您将使用javascript+date对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|701625|MDN+documentation+for+the+Date+object|offset|length|701626|var+d+=+new+Date();|code-block|syntax|javascript|701627|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date^0|0|0|11|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

You would use the javascript date object:

<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date" rel="noreferrer" title="MDN documentation for the Date object">MDN documentation for the Date object</a>

<pre><code>var d = new Date();
</code></pre>

blocks|key|701912|text|GMT+-03:00示例|type|unstyled|depth|inlineStyleRanges|entityRanges|data|701913|new+Date(new+Date()-3600*1000*3).toISOString();|code-block|syntax|javascript|701914|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|$]]

GMT -03:00 Example

<pre><code>new Date(new Date()-3600*1000*3).toISOString();
</code></pre>

blocks|key|701715|text|Node.js是一个构建在V8之上的服务器端JS平台，它是chrome+java-script运行时。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|701716|它还利用了服务器上java-script的使用。|701717|您可以使用JS+Date()函数或Date类。|701718|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Node.js is a server side JS platform build on V8 which is chrome java-script runtime. 

It leverages the use of java-script on servers too. 

You can use JS Date() function or Date class.

blocks|key|486216|text|我有一个关于MongoDB数据库的NodeJS日期的经验，我也想在这个页面上分享它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|486217|我在Mongoose+Schema上设置了一个日期字段的默认值，如下所示：|486218|{+type:+Date,+default:+new+Date()+}|code-block|syntax|javascript|486219|但一天后，我意识到默认值仍然是获取日期属于昨天。需要写成如下：|486220|{+type:+Date,+default:+()+=>+{+return+new+Date()+}+}|486221|否则，它总是得到进程开始日期，感谢@lineus在以下页面上的评论：|486222|https://github.com/Automattic/mongoose/issues/3675|offset|length|486223|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|0|1E|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|15|8|@]|9|@$Q|16|R|17|1|18]]|A|$]]|$1|S|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|P]]]]

I had an experience about dates on NodeJS with MongoDB database and I want to share it on this page as well,
I was setting a default value to a date field on Mongoose Schema as below code :
<pre><code>{ type: Date, default: new Date() }
</code></pre>
but after one day, I've realized that default value is still getting date belong to yesterday. it needs to be written as below :
<pre><code>{ type: Date, default: () =&gt; { return new Date() } }
</code></pre>
Otherwise it always getting process start date , thanks to @lineus's comment on the page below :
<a href="https://github.com/Automattic/mongoose/issues/3675" rel="nofollow noreferrer">https://github.com/Automattic/mongoose/issues/3675</a>

Do I have to manually run <code>date</code> command using child_process and fetch the result from it to get the date? Is there any other way using node?

How can I get date in application run by node.js?

数据库

服务器

MongoDB

是否必须使用child_process手动运行date命令并从中获取结果才能获得日期？有没有其他使用node的方法？

问如何在node.js运行的应用程序中获取日期？
EN

回答 8

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在node.js运行的应用程序中获取日期？EN

回答 8

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在node.js运行的应用程序中获取日期？
EN