Subtract from another date object

    var d = new Date();
    
    d.setHours(d.getHours() - 2);

 - [Complete reference list for Date object][1]


  [1]: http://www.w3schools.com/jsref/jsref_obj_date.asp

According to [Javascript Date Documentation][1], you can easily do this way:

    var twoHoursBefore = new Date();
    twoHoursBefore.setHours(twoHoursBefore.getHours() - 2);


And don&#39;t worry about if hours you set will be out of `0..23` range.
Date() object will update the date accordingly.


  [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/setHours


With:

    Object method(){
        ...
        return /* some complex expression */
    }

Is there a way I can see what value will be returned while debugging? Like somehow set a breakpoint that would be hit right after the return, but before execution goes to the calling code?  I&#39;d like to be able to know what the return value is and also be able to see what values of all of the local variables are.

The way I do it now is by making a temporary variable: `Object ret = /* something complex */; return ret;`. But thats a hassle and also adds an extra unnecessary line of code.


Note: This is the same question as https://stackoverflow.com/questions/268048/can-i-find-out-the-return-value-before-returning-while-debugging-in-visual-studio, but for intellij.

Can I find out the return value before returning while debugging in Intellij?

In the MongoDB console how can I remove a record by id? Here&#39;s my collection :

    [ 
      {
         &quot;_id&quot; : { &quot;$oid&quot; : &quot;4d512b45cc9374271b02ec4f&quot; },
         &quot;name&quot; : &quot;Gazza&quot;
      },
      {
         &quot;_id&quot; : { &quot;$oid&quot; : &quot;4d513345cc9374271b02ec6c&quot; },
         &quot;name&quot; : &quot;Dave&quot;,
         &quot;adminOf&quot; : { },
         &quot;email&quot; : &quot;email@email.com&quot;
      }
    ]

And here are the commands I&#39;ve tried that don&#39;t work :

    db.test_users.remove( {&quot;_id&quot;:{&quot;$oid&quot;:new ObjectId(&quot;4d512b45cc9374271b02ec4f&quot;)}});
    db.test_users.remove( {&quot;_id&quot;:{&quot;$oid&quot;:&quot;4d513345cc9374271b02ec6c&quot;}});
    db.test_users.remove( {&quot;_id&quot;:&quot;4d512b45cc9374271b02ec4f&quot;});
    db.test_users.remove( {&quot;_id&quot;:new ObjectId(&quot;4d512b45cc9374271b02ec4f&quot;)});

Removing by name works :

    db.test_users.remove( {&quot;name&quot;:&quot;Gazza&quot;});

This is in the browser shell on at [mongodb.org][1] if that makes any difference

Thanks


  [1]: http://mongodb.org

Remove by _id in MongoDB console

Can anyone give me a simple JavaScript code block that will allow me to display the local time minus 2 hours?



How to subtract 2 hours from user&#39;s local time?

<p>Can anyone give me a simple JavaScript code block that will allow me to display the local time minus 2 hours?</p>


I have a field at a grid containing date/time and I need to know the difference between that and the current date/time. What could be the best way of doing so?

The dates are stored like `&quot;2011-02-07 15:13:06&quot;`.

How to subtract date/time in JavaScript?

I would like to use the CommonJS module system in a clientside javascript application. I chose nodejs as implementation but can&#39;t find any tutorial or docs on how to use nodejs clientside, ie without using `node application.js`

I included node.js like this in my html page:

    &lt;script type=&quot;text/javascript&quot; src=&quot;node.js&quot;&gt;&lt;/script&gt;

Note that I didn&#39;t make nodejs on my local machine, I&#39;m on Windows anyway (I&#39;m aware of the Cygwin option). 
When I want to use the `require` function in my own javascript it says it&#39;s undefined.

    var logger = require(&#39;./logger&#39;);

My question is, is it possible to use nodejs like this?

how to use node.js module system on the clientside

I have a web page that handles remote control of a machine through Ajax. When user navigate away from the page, I&#39;d like to automatically disconnect from the machine. So here is the code:


    window.onbeforeunload = function () {
      bas_disconnect_only();
    }

The disconnection function simply send a HTTP GET request to a PHP server side script, which does the actual work of disconnecting:

    function bas_disconnect_only () {
       var xhr = bas_send_request(&quot;req=10&quot;, function () {
       });
    }

This works fine in FireFox. But with Chrome, the ajax request is not sent at all. There is a unacceptable workaround: adding alert to the callback function:

    function bas_disconnect_only () {
       var xhr = bas_send_request(&quot;req=10&quot;, function () {
         alert(&quot;You&#39;re been automatically disconnected.&quot;);
       });
    }

After adding the alert call, the request would be sent successfully. But as you can see, it&#39;s not really a work around at all.

Could somebody tell me if this is achievable with Chrome? What I&#39;m doing looks completely legit to me.


Thanks,





window.onbeforeunload ajax request in Chrome

I am new to underscore.js. What is the purpose of `[context]` in `_.each()`? How should it be used?

What is context in _.each(list, iterator, [context])?

I&#39;m trying to explore the posibilities with running a native web-app on different platforms using HTML5. Currently, an `&lt;input type=&quot;date&quot;&gt;`field just opens the standard soft keyboard on Android and iOS. I suppose that in the future the mobile OS&#39;s soft keyboards will include date pickers and such - just as `&lt;select&gt;` invokes the native select today.

Since this isn&#39;t implemented on either Android or iOS, but is implemented in native UI, is it possible for a web-app to invoke the native date picker, i.e. when clicked on?

This would make it possible for us to stop using JavaScript libraries like jQuery mobile and YUI.

If my question is in any way unclear, please tell me. Thank you in advance :-)

Invoke native date picker from web-app on iOS/Android

A=&quot;2002-20-10&quot;  
B=&quot;2003-22-11&quot; 

How to find the difference in days between two dates?

How to find the difference in days between two dates?

In other words, I want functionality that provides Joda-Time:

    today = today.withTime(0, 0, 0, 0);

but without Joda-Time, only with java.util.Date.

Methods such as .setHours() and etc. are deprecated. Is there are more correct way?

How to get today&#39;s Date?

Continuing from Stack Overflow question *https://stackoverflow.com/questions/2806360*:

What is the most efficient way to get a Date object without the time? Is there any other way than these two?

    // Method 1
    SimpleDateFormat sdf = new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);
    Date dateWithoutTime = sdf.parse(sdf.format(new Date()));

    // Method 2
    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.HOUR_OF_DAY, 0);
    cal.set(Calendar.MINUTE, 0);
    cal.set(Calendar.SECOND, 0);
    cal.set(Calendar.MILLISECOND, 0);
    dateWithoutTime = cal.getTime();

**Update**:

1. I knew about [Joda-Time][1]; I am just trying to avoid additional library for such a simple (I think) task. But based on the answers so far Joda-Time seems extremely popular, so I might consider it.

2. By _efficient_, I mean I want to avoid temporary object `String` creation as used by `method 1`, meanwhile `method 2` seems like a hack instead of a solution.

  [1]: http://www.joda.org/joda-time/


How do I get a Date without time in Java?

Basically, as the title says. I&#39;m wondering how I could add 1 day to an `NSDate`.

So if it were:

    21st February 2011

It would become:

    22nd February 2011

Or if it were:

    31st December 2011

It would become:

    1st January 2012.

Content Type	Original Author	Original Content on Stackoverflow
Question	Etienne	View Question on Stackoverflow
Solution 1 - Javascript	BrunoLM	View Answer on Stackoverflow
Solution 2 - Javascript	Kostanos	View Answer on Stackoverflow

How to subtract 2 hours from user's local time?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

Remove by _id in MongoDB console

Can I find out the return value before returning while debugging in Intellij?

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