datetime

[Hrvoje Voda]

How to convert text from textbox "12.05.1977" into "12/05/1977"? and also
check if the text is in right format before

converting?

Hrcko

 

[Ashot Geodakov]

How to convert text from textbox "12.05.1977" into "12/05/1977"? and also
check if the text is in right format before

converting?

Hrcko

string strDate = "12.05.1977";
strDate = strDate.Replace( '.', '/' );
DateTime dt;
bool b = DateTime.TryParse( strDate, out dt );
if( b ) // correct date format
{
}

 

[Peter Duniho]

How to convert text from textbox "12.05.1977" into "12/05/1977"? and also
check if the text is in right format before converting?

What type do you want the data to be in when you're done? Your post
literally taken is asking to reformat a string into a different string.
Is that what you want? Or do you really want a DateTime object when
you're done?

If you want a string, one possibility is to use the String.Replace()
method, as suggested in Ashot's post (but of course you wouldn't bother
with the DateTime.Parse() call in his code). Of course, that wouldn't
check the format for you.

If you want a DateTime, then IMHO it is pointless to do any string
conversion first (including the call to String.Replace() that Ashot
suggests). Assuming the input string must be in the format you've
provided, this code will check the format and convert at the same time:

DateTime dt;
string strInput = "12.05.1977";

if (DateTime.TryParseExact(strInput, "MM.dd.yyyy",
CultureInfo.InvariantCulture, DateTimeStyles.None, out dt))
{
// String is a correctly formatted DateTime, and
// the value is now in the dt variable.
}

If you want a string, AND you do want to verify that the original string
is parse-able as a DateTime, then I would actually use the above, and
then inside the if() statement's block, include this:

string strOutput = dt.ToString("MM/dd/yyyy");

You could of course do some explicit checking of the format yourself,
and doing so could even have better performance (especially since the
format conversion at that point is a simple search-and-replace, rather
than a full DateTime-to-string conversion), but it seems to me that the
DateTime class formatter will do just that, with easy-to-read, simple code.

Pete

 

[Hrvoje Voda]

I get an error for CultureInfo.InvariantCulture and DateTimeStyles.None

What namespace should I use for this property?

Hrcko

 

[Peter Duniho]

I get an error for CultureInfo.InvariantCulture and DateTimeStyles.None

What namespace should I use for this property?

Well, assuming you don't just want to use Visual Studio's built-in
"Resolve" feature, you can manually add the System.Globalization
namespace to your using directives.

Personally, I prefer to just let Visual Studio tell me what namespace I
need. It works fine, as long as the namespace is in an assembly
your project already references.

Pete

 

[Jon Skeet [C# MVP]]

I get an error for CultureInfo.InvariantCulture and DateTimeStyles.None

What namespace should I use for this property?

It's not the property - it's probably the class.

The best thing to do when you don't know a namespace is to look up the
type in MSDN.

In this case, both CultureInfo and DateTimeStyles are in
System.Globalization.

Jon

 

[Hrvoje Voda]

It's not working.
If clause does not pass.

It's not the property - it's probably the class.

The best thing to do when you don't know a namespace is to look up the
type in MSDN.

In this case, both CultureInfo and DateTimeStyles are in
System.Globalization.

Jon

 

[Jon Skeet [C# MVP]]

It's not working.
If clause does not pass.

Please post a short but complete program demonstrating the problem.

See http://pobox.com/~skeet/csharp/complete.html for more about what I
mean.

Jon

 

[Hrvoje Voda]

Code:
DateTime dt;


if (DateTime.TryParseExact(txtDatumRod.Text, "MM.dd.yyyy",

CultureInfo.InvariantCulture, DateTimeStyles.None, out dt))

{

txtDatumRod.Text = dt.ToString("MM/dd/yyyy");

}



Hrcko

 

[Jon Skeet [C# MVP]]

Code:

Please read http://pobox.com/~skeet/csharp/incomplete.html

Jon