DateTime.ToShortTimeString and 24 hour time

**Morten Wennevik** · Nov 16 '05, 04:31 AM

Re: DateTime.ToShor tTimeString and 24 hour time

Hi Robert,

Are you sure you are changing the time correctly. Remember, to get rid of the AM/PM symbol you need to remove the 'tt' part. Also, just changing the time does not appear to affect the program, you need to rebuild it (not just hit F5, which will do nothing if you haven't changed the code).

To test how it would appear it different localizations you can programmaticall y change the programs "location".

Thread.CurrentT hread.CurrentCu lture = new CultureInfo("nb-NO");
// Norwegian bokmål, uses a 24 hour clock

Happy coding!
Morten Wennevik [C# MVP]

**Robert Misiak** · Nov 16 '05, 04:31 AM

Re: DateTime.ToShor tTimeString and 24 hour time

Hello Morten:

Thanks for your reply. I'm pretty sure that I changed the time format
correctly on the test system as changing it changed the time shown in the
system tray to 24 hour format. However, my goal is not to rebuild many
different versions of the program for use in different localities; I'd like
the program to be able to determine the local time format (as configured in
the Control Panel at least) and display it accordingly. Is this stored
somewhere in the registry?

Robert

"Morten Wennevik" <MortenWennevik @hotmail.com> wrote in message
news:opr76jv3ol klbvpo@morten_x .edunord...[color=blue]
> Hi Robert,
>
> Are you sure you are changing the time correctly. Remember, to get rid of[/color]
the AM/PM symbol you need to remove the 'tt' part. Also, just changing the
time does not appear to affect the program, you need to rebuild it (not just
hit F5, which will do nothing if you haven't changed the code).[color=blue]
>
> To test how it would appear it different localizations you can[/color]
programmaticall y change the programs "location".[color=blue]
>
> Thread.CurrentT hread.CurrentCu lture = new CultureInfo("nb-NO");
> // Norwegian bokmål, uses a 24 hour clock
>
>
> Happy coding!
> Morten Wennevik [C# MVP][/color]

**Morten Wennevik** · Nov 16 '05, 04:31 AM

Re: DateTime.ToShor tTimeString and 24 hour time

Hm, odd, DateTime.ToShor tTimeString seems to ignore customized time formats alltogether. Rebuilding won't matter.
If you change your current country settings the program should detect it fine without the need for a rebuild.

Happy coding!
Morten Wennevik [C# MVP]

**Robert Misiak** · Nov 16 '05, 04:31 AM

Re: DateTime.ToShor tTimeString and 24 hour time

You're right. Initially I kept the locality as US/English and only changed
the time format (which should have worked anyway, but that's another story.)
I just now changed the locality to Norwegian (Bokmal) and it displayed the
times correctly, and even displayed the names of the months in Norwegian, as
I had hoped. Guess we already are international-friendly. :-) Thanks for
your help.

Robert

"Morten Wennevik" <MortenWennevik @hotmail.com> wrote in message
news:opr76mf9b0 klbvpo@morten_x .edunord...[color=blue]
> Hm, odd, DateTime.ToShor tTimeString seems to ignore customized time[/color]
formats alltogether. Rebuilding won't matter.[color=blue]
> If you change your current country settings the program should detect it[/color]
fine without the need for a rebuild.[color=blue]
>
> Happy coding!
> Morten Wennevik [C# MVP][/color]

**Marcin Grzêbski** · Nov 16 '05, 04:31 AM

Re: DateTime.ToShor tTimeString and 24 hour time

Hi Robert!
[color=blue]
> Hello-
>
> I live in the US, however I'm attempting to make a product of mine more
> international-friendly. There are a number of instances where a calendar
> function of my program displays various times, which is displayed using
> DateTime.ToShor tTimeString(). This always displays them in an AM/PM format.
> When I go into the test computer's locality and change the time format to 24
> hour time, the program still displays times in AM/PM format. Is there a
> better way to implement this, so that either AM/PM or 24 hour time will be
> displayed based upon the user's locality? Thank you.
>
> Robert[/color]

Use DataTime custom formatting!
There's no philosophy in time format, so i can recomend
to use this:

DateTime.ToStri ng("HH:mm:ss") ;
// besides of DateTime.ToStri ng("hh:mm:ss") ;

For more info, look in .NET docs for "DateTimeFormat Info"

Cheers!

Marcin

**Morten Wennevik** · Nov 16 '05, 04:31 AM

Re: DateTime.ToShor tTimeString and 24 hour time

> DateTime.ToStri ng("HH:mm:ss") ;[color=blue]
> // besides of DateTime.ToStri ng("hh:mm:ss") ;[/color]

Would you know how to add the AM/PM part?
DateTime.ToStri ng("hh:mm:ss tt") won't do anything since I have no defined AM or PM symbols in the regional settings.

Happy coding!
Morten Wennevik [C# MVP]

**Ed Courtenay** · Nov 16 '05, 04:31 AM

Re: DateTime.ToShor tTimeString and 24 hour time

Morten Wennevik wrote:
[color=blue][color=green]
>> DateTime.ToStri ng("HH:mm:ss") ;
>> // besides of DateTime.ToStri ng("hh:mm:ss") ;[/color]
>
>
> Would you know how to add the AM/PM part?
> DateTime.ToStri ng("hh:mm:ss tt") won't do anything since I have no
> defined AM or PM symbols in the regional settings.
>
>
> Happy coding!
> Morten Wennevik [C# MVP][/color]

You simply don't need to do this. Try the following code:

public static void Main()
{
string dateString = "Tue, 27 Apr 2004 08:16:13 GMT";
DateTime dateTime = DateTime.Parse( dateString);

Thread.CurrentT hread.CurrentCu lture = new CultureInfo("en-US");
Console.WriteLi ne(Thread.Curre ntThread.Curren tCulture.Englis hName);
Console.WriteLi ne("{0}", dateTime.ToStri ng("T"));

Thread.CurrentT hread.CurrentCu lture = new CultureInfo("de-DE");
Console.WriteLi ne(Thread.Curre ntThread.Curren tCulture.Englis hName);
Console.WriteLi ne("{0}", dateTime.ToStri ng("T"));

Console.ReadLin e();
}

--

Ed Courtenay
[MCP, MCSD]

http://www.edcourtenay.co.uk

DateTime.ToShortTimeString and 24 hour time

DateTime.ToShortTimeString and 24 hour time

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