Will it always start with `ORDER`?

    string pattern = &quot;&#39;ORDER&#39;yyyyMMddHHmmss&quot;;
    DateTime dt;
    if (DateTime.TryParseExact(text, pattern, CultureInfo.InvariantCulture, 
                               DateTimeStyles.None,
                               out dt))
    {
        // dt is the parsed value
    } 
    else 
    {
        // Invalid string
    }

If the string being invalid should throw an exception, then use [`DateTime.ParseExact`][1] instead of [`DateTime.TryParseExact`][2]

If it doesn&#39;t always begin with &quot;ORDER&quot; then do whatever you need to in order to get just the date and time part, and remove &quot;&#39;ORDER&#39;&quot; from the format pattern above.

  [1]: http://msdn.microsoft.com/en-us/library/system.datetime.parseexact.aspx
  [2]: http://msdn.microsoft.com/en-us/library/ms131044.aspx

You can use [DateTime.ParseExact][1] method to specify the format that should be used while parsing.


  [1]: http://msdn.microsoft.com/en-us/library/system.datetime.parseexact.aspx

If you don&#39;t have a fixed structure of your string say order will not always be there then you can use regex to separate the numbers and characters and then use convert to datetime function for the numbers separated.

I&#39;m making a custom error dialog in my WPF app and I want to use a [standard windows error icon][1]. Can I get the OS-specific icon from WPF? If not, does anyone know where to get .pngs with transparency of them? Or know where in Windows to go extract them from?

So far my searches have turned up nothing.


  [1]: http://msdn.microsoft.com/en-us/library/aa511277.aspx

How do I use standard Windows warning/error icons in my WPF app?

I am writing an app for BlackBerry that utilizes a BlackBerry smartcard reader. There is not much documentation on the subject, so I&#39;d really like if someone could give me starting examples.

Basically, there is one RSA private key on the card plus a certificate (for paired public key). I would like to be able to encrypt/decrypt data and also sign it as well. The final goal would be to establish an mutual-authenticated SSL connection using client certificate contained on the smartcard.

Here is the code I managed to come up with so far:

    SmartCardReader btReader = null;
    SmartCardReader[] readers = SmartCardReaderFactory.getInstalledReaders();
    for (int i = 0; i &lt; readers.length; i++) {
        SmartCardReader reader = readers[i];
        if (reader.getType().equalsIgnoreCase(&quot;bluetooth&quot;)) {
            btReader = reader;
            break;
        }
    }
    
    SmartCardReaderSession readerSession = reader.openSession();
    CryptoSmartCard card = (CryptoSmartCard) readerSession.getSmartCard();
    RSACryptoToken token = (RSACryptoToken) card.getCryptoToken(&quot;RSA&quot;);

This `token` looks promising - has some nice methods, but with &quot;cryptic&quot; arguments. What to do next?

Blackberry smartcard reader example

I have a string of the next format `&quot;ORDER20100322194007&quot;`, where `20100322` is a date and `194007` is a time. How to parse a string and get the contained `DateTime` object?

Parse a string containing date and time in a custom format

<p>I have a string of the next format <code>"ORDER20100322194007"</code>, where <code>20100322</code> is a date and <code>194007</code> is a time. How to parse a string and get the contained <code>DateTime</code> object?</p>


I want to do something like this:

       private User PopulateUsersList(DataRow row)
            {
                Users user = new Users();
                user.Id = int.Parse(row[&quot;US_ID&quot;].ToString());
                if (row[&quot;US_OTHERFRIEND&quot;] != null)
                {
                    user.OtherFriend = row[&quot;US_OTHERFRIEND&quot;].ToString();
                }
                return user;
            }

However, I get an error saying `US_OTHERFRIEND` does not belong to the table.
I want to simply check if it is not null, then set the value.

Isn&#39;t there a way to do this?



Check if DataRow exists by column name in c#?

Ok, so this may be a bit of a silly question, and there&#39;s certainly the obvious answer, but I was curious if I&#39;ve missed any subtleties here.

Is there any difference in terms of visibility/usability between a `public` member declared in an `internal` class and an `internal` member declared in an `internal` class?

i.e. between

    internal class Foo
    {
        public void Bar()
        {
        }
    }

and

    internal class Foo
    {
        internal void Bar()
        {
        }
    }

If you declared the method as `public` and also `virtual`, and then overrode it in a derived class that is `public`, the reason for using this modifier is clear. However, is this the only situation... am I missing something else?

Public and Internal members in an Internal class?

Using c# 4.0 -- building an interface and a class that implements the interface. I want to declare an optional parameter in the interface and have it be reflected in the class. So, I have the following:

     public interface IFoo
     {
          void Bar(int i, int j=0);
     }

     public class Foo
     {
          void Bar(int i, int j=0) { // do stuff }
     }

This compiles, but it doesn&#39;t look right. The interface needs to have the optional parameters, because otherwise it doesn&#39;t reflect correctly in the interface method signature. 

Should I skip the optional parameter and just use a nullable type? Or will this work as intended with no side effects or consequences?

Optional parameters for interfaces

Here is the MSDN article on [abstract classes][1], but I really don&#39;t get it...

When should I really use abstract classes? What are the advantages of using abstract classes?


  [1]: http://msdn.microsoft.com/en-us/library/ms173150.aspx

When to use abstract classes?

I need help with creating a C# method that returns the index of the Nth occurrence of a character in a string.

For instance, the 3rd occurrence of the character `&#39;t&#39;` in the string `&quot;dtststxtu&quot;` is 5.  
(Note that the string has 4 `t`s.)

Find Nth occurrence of a character in a string

`Long.parseLong(&quot;string&quot;)` throws an error if string is not parsable into long.
Is there a way to validate the string faster than using `try-catch`?
Thanks

Check whether a string is parsable into Long without try-catch?

I am trying to parse a date that looks like this:

&gt; 2010-04-05T17:16:00Z

This is a valid date per http://www.ietf.org/rfc/rfc3339.txt. The &#39;Z&#39; literal (quote) &quot;*imply that UTC is the preferred reference point for the specified time.*&quot;

If I try to parse it using SimpleDateFormat and this pattern:

    yyyy-MM-dd&#39;T&#39;HH:mm:ss

it will be parsed as a Mon Apr 05 17:16:00 EDT 2010

&lt;br&gt;
`SimpleDateFormat` is unable to parse the string with these patterns:

    yyyy-MM-dd&#39;T&#39;HH:mm:ssz
    yyyy-MM-dd&#39;T&#39;HH:mm:ssZ


I can explicitly set the *TimeZone* to use on the `SimpleDateFormat` to get the expected output, but I don&#39;t think that should be necessary. Is there something I am missing? Is there an alternative date parser?

SimpleDateFormat parsing date with &#39;Z&#39; literal

I have the following JSON text. How can I parse it to get the values of `pageName`, `pagePic`, `post_id`, etc.?

``` lang-json
    {
       &quot;pageInfo&quot;: {
             &quot;pageName&quot;: &quot;abc&quot;,
             &quot;pagePic&quot;: &quot;http://example.com/content.jpg&quot;
        },
        &quot;posts&quot;: [
             {
                  &quot;post_id&quot;: &quot;123456789012_123456789012&quot;,
                  &quot;actor_id&quot;: &quot;1234567890&quot;,
                  &quot;picOfPersonWhoPosted&quot;: &quot;http://example.com/photo.jpg&quot;,
                  &quot;nameOfPersonWhoPosted&quot;: &quot;Jane Doe&quot;,
                  &quot;message&quot;: &quot;Sounds cool. Can&#39;t wait to see it!&quot;,
                  &quot;likesCount&quot;: &quot;2&quot;,
                  &quot;comments&quot;: [],
                  &quot;timeOfPost&quot;: &quot;1234567890&quot;
             }
        ]
    }
```

How to parse JSON in Java

I am trying to extract the content of a single &quot;value&quot; attribute in a specific &quot;input&quot; tag on a webpage. I use the following code:

    import urllib
    f = urllib.urlopen(&quot;http://58.68.130.147&quot;)
    s = f.read()
    f.close()
    
    from BeautifulSoup import BeautifulStoneSoup
    soup = BeautifulStoneSoup(s)
    
    inputTag = soup.findAll(attrs={&quot;name&quot; : &quot;stainfo&quot;})
    
    output = inputTag[&#39;value&#39;]
    
    print str(output)

I get a TypeError: list indices must be integers, not str

even though from the Beautifulsoup documentation i understand that strings should not be a problem here... but i a no specialist and i may have misunderstood. 

Any suggestion is greatly appreciated!





Extracting an attribute value with beautifulsoup

What is the actual difference between LR, SLR, and LALR parsers? I know that SLR and LALR are types of LR parsers, but what is the actual difference as far as their parsing tables are concerned?

And how to show whether a grammar is LR, SLR, or LALR? For an LL grammar we just have to show that any cell of the parsing table should not contain multiple production rules. Any similar rules for LALR, SLR, and LR?

For example, how can we show that the grammar

    S --&gt; Aa | bAc | dc | bda
    A --&gt; d

is LALR(1) but not SLR(1)?

---

**EDIT (ybungalobill)**: I didn&#39;t get a satisfactory answer for what&#39;s the difference between LALR and LR. So LALR&#39;s tables are smaller in size but it can recognize only a subset of LR grammars. Can someone elaborate more on the difference between LALR and LR please? LALR(1) and LR(1) will be sufficient for an answer. Both of them use 1 token look-ahead and *both* are table driven! How they are different?

What is the difference between LR, SLR, and LALR parsers?

I have a `Date` object. **How do I render the `title` portion of the following snippet?**

    &lt;abbr title=&quot;2010-04-02T14:12:07&quot;&gt;A couple days ago&lt;/abbr&gt;

_I have the &quot;relative time in words&quot; portion from another library._

I&#39;ve tried the following:

    function isoDate(msSinceEpoch) {

       var d = new Date(msSinceEpoch);
       return d.getUTCFullYear() + &#39;-&#39; + (d.getUTCMonth() + 1) + &#39;-&#39; + d.getUTCDate() + &#39;T&#39; +
              d.getUTCHours() + &#39;:&#39; + d.getUTCMinutes() + &#39;:&#39; + d.getUTCSeconds();

    }

But that gives me:

    &quot;2010-4-2T3:19&quot;


How do I output an ISO 8601 formatted string in JavaScript?

    $date1 = $date2 = new DateTime();
    $date2-&gt;add(new DateInterval(&#39;P3Y&#39;));

Now `$date1` and `$date2` contain the same date -- three years from now. I&#39;d like to create two separate datetimes, one which is parsed from a string and one with three years added to it. Currently I&#39;ve hacked it up like this:

    $date2 =  new DateTime($date1-&gt;format(DateTime::ISO8601));

but that seems like a horrendous hack. Is there a &quot;correct&quot; way to deep copy a DateTime object?

How do I deep copy a DateTime object?

I have a variable which is `&lt;type &#39;datetime.timedelta&#39;&gt;` and I would like to compare it against certain values. 

Lets say d produces this `datetime.timedelta` value `0:00:01.782000`

I would like to compare it like this:

    #if d is greater than 1 minute 
    if d&gt;1:00:
      print &quot;elapsed time is greater than 1 minute&quot;

I have tried converting `datetime.timedelta.strptime()` but that does seem to work. Is there an easier way to compare this value?




Comparing a time delta in python

I have 2 asp.net texboxes with calendar extender. I want to find out the number of days between both dates when one of the date control is changed. how can I achieve this using jquery or javascript?


JQuery Calculate Day Difference in 2 date textboxes

I want to compare UTC timestamps from a log file with local timestamps. When creating the local `datetime` object, I use something like:

    &gt;&gt;&gt; local_time=datetime.datetime(2010, 4, 27, 12, 0, 0, 0, 
                                     tzinfo=pytz.timezone(&#39;Israel&#39;))

I want to find an automatic tool that would replace the`tzinfo=pytz.timezone(&#39;Israel&#39;)` with the current local time zone.

Any ideas?



Python: Figure out local timezone

I am trying to use [time()](http://en.cppreference.com/w/cpp/chrono/c/time) to measure various points of my program.

What I don&#39;t understand is why the values in the before and after are the same?  I understand this is not the best way to profile my program, I just want to see how long something take.  

    printf(&quot;**MyProgram::before time= %ld\n&quot;, time(NULL));
    
    doSomthing();
    doSomthingLong();
    
    printf(&quot;**MyProgram::after time= %ld\n&quot;, time(NULL));

I have tried:

    struct timeval diff, startTV, endTV;

    gettimeofday(&amp;startTV, NULL); 

    doSomething();
    doSomethingLong();

    gettimeofday(&amp;endTV, NULL); 

    timersub(&amp;endTV, &amp;startTV, &amp;diff);
    
    printf(&quot;**time taken = %ld %ld\n&quot;, diff.tv_sec, diff.tv_usec);

How do I read a result of `**time taken = 0 26339`?  Does that mean 26,339 nanoseconds = 26.3 msec?

What about `**time taken = 4 45025`, does that mean 4 seconds and 25 msec?

Easily measure elapsed time

What is the function to get the current UTC time. I have tried with System.getCurrentTime but i get the current date and time of the device.

Thanks

Android get Current UTC time

 We can do this:
 
    i = Time.now.to_i 

  for example current:
     
    i = 1274335854

can I convert i back to time?

Ruby / Rails: convert int to time OR get time from integer?

How do I check if daylight saving time is in effect?

Content Type	Original Author	Original Content on Stackoverflow
Question	akrisanov	View Question on Stackoverflow
Solution 1 - C#	Jon Skeet	View Answer on Stackoverflow
Solution 2 - C#	Giorgi	View Answer on Stackoverflow
Solution 3 - C#	Samiksha	View Answer on Stackoverflow

Parse a string containing date and time in a custom format

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Blackberry smartcard reader example

How do I use standard Windows warning/error icons in my WPF app?

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