Use upper-case `HH` for 24h format:

    String s = curr.ToString(&quot;HH:mm&quot;);

See [DateTime.ToString Method](http://msdn.microsoft.com/en-us/library/zdtaw1bw.aspx).

    Console.WriteLine(curr.ToString(&quot;HH:mm&quot;));

What are some good ways to organize large Node.js projects?

For example, an app making use of both express.js and socket.io? This would include both application logical structure as well as filesystem.

Currently, I&#39;m finding myself shoving a ton of code into a single master js file and placing code into a giant global object, and it feels naughty.

How to organize large Node.js projects

For a task like this:

    from celery.decorators import task
    
    @task()
    def add(x, y):
        if not x or not y:
            raise Exception(&quot;test error&quot;)
        return self.wait_until_server_responds(

if it throws an exception and I want to retry it from the daemon side, how can apply an exponential back off algorithm, i.e. after `2^2, 2^3,2^4` etc seconds?   

Also is the retry maintained from the server side, such that if the worker happens to get killed then next worker that spawns will take the retry task?

Retry Celery tasks with exponential back off

I need string from datetime to display time in 24 hours format. 

    ..
    var curr = DateTime.Now;
    string s = ???;
    Console.WriteLine(s);
    ..

The output result have to be: &quot;16:38&quot;
Thank you.

How to format DateTime to 24 hours time?

I need string from datetime to display time in 24 hours format.
<pre><code class="hljs language-ini">..
var curr = DateTime.Now;
string s = ???;
Console.WriteLine(s);
..
</code></pre>
The output result have to be: "16:38"
Thank you.

I love the null-coalescing operator because it makes it easy to assign a default value for nullable types.

     int y = x ?? -1;

That&#39;s great, except if I need to do something simple with `x`. For instance, if I want to check `Session`, then I usually end up having to write something more verbose.

I wish I could do this:

    string y = Session[&quot;key&quot;].ToString() ?? &quot;none&quot;;

But you can&#39;t because the `.ToString()` gets called before the null check so it fails if `Session[&quot;key&quot;]` is null. I end up doing this:

    string y = Session[&quot;key&quot;] == null ? &quot;none&quot; : Session[&quot;key&quot;].ToString();

It works and is better, in my opinion, than the three-line alternative:

    string y = &quot;none&quot;;
    if (Session[&quot;key&quot;] != null)
        y = Session[&quot;key&quot;].ToString();

Even though that works I am still curious if there is a better way. It seems no matter what I always have to reference `Session[&quot;key&quot;]` twice; once for the check, and again for the assignment. Any ideas?

What is the proper way to check for null values?

I would like to get the name of a variable or parameter:

For example if I have: 

    var myInput = &quot;input&quot;;
    
    var nameOfVar = GETNAME(myInput); // ==&gt; nameOfVar should be = myInput
    
    void testName([Type?] myInput)
    {
       var nameOfParam = GETNAME(myInput); // ==&gt; nameOfParam should be = myInput
    }

How can I do it in C#?

get name of a variable or parameter

I want to create NUnit test to ensure that my function does not throw an exception. Is there some specific way to do it, or I should just write

    [Test]
    public void noExceptionTest() {
      testedFunction();
    }

and it will succeed if no exception is thrown?

Test with NO expected exception

Is there a way to make this method generic so I can return a string, bool, int, or double?  Right now, it&#39;s returning a string, but if it&#39;s able find &quot;true&quot; or &quot;false&quot; as the configuration value, I&#39;d like to return a bool for example.


        public static string ConfigSetting(string settingName)
        {  
             return ConfigurationManager.AppSettings[settingName];
        }


How do I make the return type of a method generic?

&gt; **Possible Duplicate:**  
&gt; [How to identify if string contain a number?](https://stackoverflow.com/questions/894263/how-to-identify-if-string-contain-a-number)  

&lt;!-- End of automatically inserted text --&gt;

In VB there&#39;s an IsNumeric function, is there something similar in c#?  

To get around it, I just wrote the code:

        if (Int32.Parse(txtMyText.Text.Trim()) &gt; 0)


I was just wondering if there is a better way to do this.

How to check if IsNumeric

I want to remove time from `Date` object.

    DateFormat df;
    String date;
    df = new SimpleDateFormat(&quot;dd/MM/yyyy&quot;);
    d = eventList.get(0).getStartDate(); // I&#39;m getting the date using this method
    date = df.format(d); // Converting date in &quot;dd/MM/yyyy&quot; format

But when I&#39;m converting this date (which is in `String` format) it is appending time also.

I don&#39;t want time at all. What I want is simply &quot;21/03/2012&quot;.


Removing time from a Date object?

Since MySQL evidently cannot automatically insert the function now() in a datetime field in adding new records like some other databases, based on comments, I&#39;m explicitly trying to insert it using an SQL statement. (People seem to think timestamp with curdate() is not the answer due to the various limitations of timestamp.) There are numerous articles on the web suggesting inserting now() using SQL should work.

When I try to insert the date time using the SQL statement, however, the field does not populate with the current time/date, but it only gives me the default 0000-00-, etc. This is probably a syntax error, but it&#39;s driving me crazy, so I am posting it. 

    mysql_query(&quot;INSERT INTO users (first, last, whenadded) VALUES (&#39;$first&#39;, &#39;$last&#39;, now())&quot;; 

It inserts first and last, but nothing for when added, leaving 0000-00-00, etc. in the whenadded field.

The field type is datetime, it has no collation, attributes, null default or extra. BTW, I tried putting now() in single quotes... It threw an error.


Insert current date/time using now() in a field using MySQL/PHP

I want to find out the following:
given a date (`datetime` object), what is the corresponding day of the week?

For instance, Sunday is the first day, Monday: second day.. and so on

And then if the input is something like today&#39;s date.


## Example

    &gt;&gt;&gt; today = datetime.datetime(2017, 10, 20)
    &gt;&gt;&gt; today.get_weekday()  # what I look for

The output is maybe `6` (since it&#39;s Friday)

How do I get the day of week given a date?

I have this code snippet:

    DateFormat formatter1;
    formatter1 = new SimpleDateFormat(&quot;mm/DD/yyyy&quot;);
    System.out.println((Date)formatter1.parse(&quot;08/16/2011&quot;));

When I run this, I get this as the output:

    Sun Jan 16 00:10:00 IST 2011

I expected:

    Tue Aug 16 &quot;Whatever Time&quot; IST 2011

I mean to say I am not getting the month as expected. What is the mistake?

How to convert a String to a Date using SimpleDateFormat?

I would declare an empty String variable like this:

        string myString = string.Empty;

Is there an equivalent for a &#39;DateTime&#39; variable ?


Update :

The problem is I use this &#39;DateTime&#39; as a parameter for a &#39;StoredProcedure&#39; in SQL.
E.g:

        DateTime? someDate = null;
        myCommand.Parameters.AddWithValue(&quot;@SurgeryDate&quot;, someDate);

When I run this code an exception is catched telling me the &#39;StoredProcedure&#39; expected a &#39;@SurgeryDate&#39; parameter.
But i provided it.
Any idea why?

Set an empty DateTime variable

I am trying to further a question I asked yesterday where I wanted to know how to query a date in a different format. But now I am trying to do an insert using this method (see below) however I can&#39;t get it to work. I have checked the manual but it is not beginner friendly!

    INSERT INTO custorder VALUES (&#39;Kevin&#39;,&#39;yes&#39;), STR_TO_DATE(&#39;1-01-2012&#39;, &#39;%d-%m-%Y&#39;);



MySQL date formats - difficulty Inserting a date

I would like to format some commands execution times in a human readable format, for example:

    3 -&gt; 3ms
    1100 -&gt; 1s 100ms
    62000 -&gt; 1m 2s
    etc ..

Taking into account days, hours, minutes, seconds, ...

Is it possible using `C#`?

Convert milliseconds to human readable time lapse

&gt; **Possible Duplicate:**  
&gt; [&amp;ldquo;ValueError: zero length field name in format&amp;rdquo; error in Python 3.0,3.1,3.2](https://stackoverflow.com/questions/5446964/valueerror-zero-length-field-name-in-format-error-in-python-3-0-3-1-3-2)  

&lt;!-- End of automatically inserted text --&gt;

I have spent hours trying to solve this problem but to no avail. I read [this guide](http://docs.python.org/release/3.1.3/library/string.html).
I haven&#39;t found any examples how to do what I need. 

When I run the script I get this error (partly omitted):&lt;br&gt;

    Traceback (...):
       [...]
       output.write(&quot;{: &gt; 026,.18e} {: &gt; 026,.18e}\n&quot;.format(x,y))
    ValueError: zero length field name in format.

The code is written in python 2.6 or 2.7 but I run python 3.1. How would I need to change output format so that it would work? 

    def f(x,y,a = 0.01):
        return y/(a+x)-y**3

    def ekspEuler(N,dat):
        output = open(dat,&quot;w&quot;)
        h = 3.0/N
        x,y = 0,1 #zac.pogoj

        for i in range(1,N+2):
            output.write(&quot;{: &gt; 026,.18e} {: &gt; 026,.18e}\n&quot;.format(x,y))
            y += h*f(x,y)
            x = i*h
        output.close()

Thanks for your help.

ValueError: zero length field name in format python

Why are UUID&#39;s presented in the format &quot;8-4-4-4-12&quot; (digits)? I&#39;ve had a look around for the reason but can&#39;t find the decision that calls for it.

Example of UUID formatted as hex string:
58D5E212-165B-4CA0-909B-C86B9CEE0111

UUID format: 8-4-4-4-12 - Why?

I have a String `e.g: &quot;4.874915326E7&quot;`. What is the best way to convert it to a javascript number format? (int or float)? if I try parseInt(), the ***E*** at the end is ignored.

Content Type	Original Author	Original Content on Stackoverflow
Question	Yara	View Question on Stackoverflow
Solution 1 - C#	Flash	View Answer on Stackoverflow
Solution 2 - C#	paul	View Answer on Stackoverflow

How to format DateTime to 24 hours time?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Retry Celery tasks with exponential back off

How to organize large Node.js projects

Attributions