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);

但随着时间的推移,24小时又增加了2小时,而实际上,我也离开了这个日期,例如:

“17-05-2011 22:38:00”

我需要知道我如何能够增加/推迟时间,只显示钟。

Answer 1

不要增加一个时间,而是简单地称“AddHours”方法:

myDateTime.AddHours(2).ToLongTimeString();

Answer 2

我的假日。

或作为<代码>Tejs提到你可使用<代码>ToLongtimeString(,我认为这更符合你的要求。

增减小时请使用<代码>日。添加物(即使是负数小时),或用于替代物的,也可使用<代码>datetime.Subtract(时间改为分机)。

Answer 3

采用时间范围方法“ToString”方法,使你能够以你想要的任何形式完成日期。 See

Answer 4

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.
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.

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