globalisation help (date times)

[JamesB]

Hi
A problem has appeared in an app I am making. If the user has their clock
set to 12 hr format (i.e. am/pm) it breaks things as my app works in 24 hr
mode.

After some reading, I think the key to fixing this lies in globalisation...
I have amended the code as follows:

DateTime StartDatim;
DateTime EndDatim;
System.Globalization.DateTimeFormatInfo myDTFI = new
System.Globalization.CultureInfo("en-GB", false).DateTimeFormat;
myDTFI.FullDateTimePattern = "dd/MM/yyyy HH:mm:ss";
myDTFI.ShortTimePattern = "HH:mm:ss";
myDTFI.LongTimePattern = "HH:mm:ss";
StartDatim = DateTime.ParseExact(ApptDate + " " +
txtStartTime.Text,"dd/MM/yyyy HH:mm",myDTFI);
EndDatim = DateTime.ParseExact(ApptDate + " " + txtEndTime.Text,"dd/MM/yyyy
HH:mm", myDTFI);

If I get the app to halt at the last two lines, and my user has entered a
start time of 00:00 and an end time of 23:59, they are still being set in
the "StartDatim" and "EndDatim" objects as 12:00 and 11:59.
I thought the "big H" forces 24 hour, but I must be missing something, any
pointers?

Thanks
James.