C#如何计算即将到来的具体时间？

Question

我正在创建一个应用程序，它告诉我外汇市场开盘或收盘还剩多少时间。

例如，如果纽约市场刚刚收盘，现在我想知道纽约市场还剩多少时间再次开市。有些人在它开放时关闭它的时间。

我可以使用计时器来减少剩余时间，但问题是我无法获得绝对减去的剩余时间值。甚至 TimeSpan.Subtract 或 DateTime.Subtract 也不行。

编辑：我使用此代码告诉我市场开放

if ((IsTimeOfDayBetween(DateTime.UtcNow, new TimeSpan(8, 0, 0), new TimeSpan(16, 0, 0))) == true)
    {
        textBox1.Background = new SolidColorBrush(Colors.Green);

    }

但是在它关闭后，我希望它还有剩余时间再次打开，显示在文本块中。

Answer 1

请尝试以下代码。希望对您的问题有所帮助

    var dt = new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime();

    var now = System.DateTime.Now.ToUniversalTime();
    var future = new DateTime(2010, 1, 1).ToUniversalTime();

    Console.WriteLine((now - dt).TotalSeconds);
    Console.WriteLine((future - dt).TotalSeconds);

Answer 2

您可以尝试这样的操作，使用您已有的函数 "IsTimeOfDayBetween"：

    // global variables
    TimeSpan dayStart = new TimeSpan(0, 0, 0);
    TimeSpan dayEnds = new TimeSpan(23, 59, 59);

    // you have a timer(loop) every sencond, so you can have this two variables change depending on what market you are tracking, in this example NY
    TimeSpan NyOpens = new TimeSpan(8, 0, 0);
    TimeSpan NyClose = new TimeSpan(16, 0, 0);

    // variable to store the result
    TimeSpan tillOpenClose;

    if ((IsTimeOfDayBetween(DateTime.UtcNow, NyOpens, NyClose)) == true)
    {
        textBox1.Background = new SolidColorBrush(Colors.Green);
        // its open, you want time till close
        // validate close time is greater than open time
        if ( NyClose.CompareTo(NyOpens) > 0)
            tillOpenClose = NyClose.Subtract(DateTime.UtcNow.TimeOfDay);
        else
            tillOpenClose = ((dayEnds.Subtract(DateTime.UtcNow.AddSeconds(-1).TimeOfDay)).Add(NyClose)); // if the market closes at and earlier time, then the time till close, is the remaing time of this day, plus the time till close of the new day
    }
    else if ((IsTimeOfDayBetween(DateTime.UtcNow, dayStart, NyOpens)) == true) // if time is between start of day and open time
        tillOpenClose = NyOpens.Subtract(DateTime.UtcNow.TimeOfDay);
    else  // it is between closetime and end of day
        tillOpenClose = ((dayEnds.Subtract(DateTime.UtcNow.AddSeconds(-1).TimeOfDay)).Add(NyOpens)); // part remaining for this day  plus new day, the extra second is to compensate the "dayEnds"

    Console.WriteLine(tillOpenClose.ToString(@"hh\:mm\:ss"));

而 "IsTimeOfDayBetween" 函数应该是这样的：

    if (open.CompareTo(close) > 0) // if open time is greater (e.g. open: (20,0,0) close: (4,0,0))
    {
        if (timeNow.TimeOfDay.CompareTo(open) >= 0 || timeNow.TimeOfDay.CompareTo(close) <= 0)
            return true;
    }
    else
    {
        if (timeNow.TimeOfDay.CompareTo(open) >= 0 && timeNow.TimeOfDay.CompareTo(close) <= 0)
            return true;
    }

    return false;

编辑：将时间更改为关闭，抱歉

EDIT2：调整关闭时间早于开放时间

C#如何计算即将到来的具体时间？

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c#

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