C#, how do I make a clock work with added hours?

Question

Using Visual Studio 2008 (C#) I have to make a working clock (digital) with the current time zone hour, and a few more with different time zones, like new york, etc.

inside the form I put 2 labels (for the clocks) and a timer, inside the timer I put this code:

 timer1.Interval = 1000;

        label1.Text = DateTime.Now.ToLongTimeString();
        DateTime myDateTime = DateTime.Now;


        TimeSpan myTimeSpan = new TimeSpan(2, 0, 0);
        DateTime myDateTime8 = myDateTime + myTimeSpan;
        label2.Text = ("" + myDateTime8);

the part with the timespan does add 2 hours to the clock, however, instead of just the actually clock I also get the date on it's left, like for example:

"17-05-2011 22:38:00"

I need to know how can I add/subtract hours and only show the clock.

Answer 1

Instead of adding a timespan, simply call the AddHours method:

myDateTime.AddHours(2).ToLongTimeString();

Answer 2

myDateTime.ToShortTimeString() will return you only time

or as Tejs mentioned you can use ToLongTimeString() that I guess more suits your requirement.

For adding or subtracting hours you can use dateTime.AddHours(even hours in negative) or for subtracting you can also use dateTime.Subtract(time to subtract)

Answer 3

Using the .ToString() method of the timespan method allows you to output the date in any format you want. See http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

Answer 4

1. For your time zone needs, use an approach similar to the one suggested in this MSDN article. Notably:
   1. Use ConvertTimeToUtc to get UTC time before performing any arithmetics.
   2. Perform required arithmetics.
   3. Convert back to local time using TimeZoneInfo.ConvertTime.
2. To get just the time part of a DateTime, use DateTime.ToShortTimeString(). Note that this is culture-aware, so if you want a fixed format, consider using DateTime.ToString() to specify a format.