Question

我只是想知道如何计算DateTime而不包括周末（目前正在建立一个图书馆系统）。图书馆在周末没有营业，这就是为什么我需要计算不包括周末的日期。防爆。 2015年3月13日=星期五，我借了5天。所以，返回日期应该是03/20/15 =星期五（因为我没有包括周末）你能告诉我还是给我一些想法？谢谢！

编辑:(当我键入数字时，程序突然冻结）

int days = 0;
DateTime deyt = DateTime.Now;
rd.Text = deyt.ToString("MM/dd/yy");
DateTime dt = deyt.AddDays(int.Parse(textBox3.Text));


DateTime span = deyt;
while (span < dt.AddDays(1))
{
    if (span.DayOfWeek != DayOfWeek.Saturday && span.DayOfWeek != DayOfWeek.Sunday)
    {
        days++;
        span = span.AddDays(1);
        bd.Text = days.ToString("MM/dd/yy");
    }
}

Answer 1

如果您有日期时间列表，则可以过滤周末日期：

public static List<DateTime> GetDatesWithoutWeekends(List<DateTime> dates)
{
    return
        dates.Where(date => (date.DayOfWeek != DayOfWeek.Saturday && date.DayOfWeek != DayOfWeek.Sunday))
                .ToList();
}

Answer 2

DateTime date = DateTime.Now // Set your Date

if (date.DayOfWeek != DayOfWeek.Saturday && date.DayOfWeek != DayOfWeek.Sunday)   
{
//TODO
}

Answer 3

有很多有效的方法可以在很长一段时间内完成此操作，但如果您的代码只处理小值，您可以使用：

static DateTime AddDaysExcludingWeekends(DateTime start, int days)
{
    // Do you need this?
    if (days < 0)
    {
        throw new ArgumentException("Not implemented yet...");
    }
    DateTime current = start;
    for (int i = 0; i < days; days++)
    {
        current = current.AddDays(1);
        if (current.DayOfWeek == DayOfWeek.Sunday ||
            current.DayOfWeek == DayOfWeek.Saturday)
        {
            // Effectively force "go round again" behaviour.
            i--;
        }
    }
    return current;
}

或另一种方法：

static DateTime AddDaysExcludingWeekends(DateTime start, int days)
{
    // Do you need this?
    if (days < 0)
    {
        throw new ArgumentException("Not implemented yet...");
    }
    DateTime current = start;
    for (int i = 0; i < days; days++)
    {
        // Loop at least once, and keep going until we're on
        // a weekday.
        do
        {
           current = current.AddDays(1);
        }
        while (current.DayOfWeek == DayOfWeek.Sunday ||
               current.DayOfWeek == DayOfWeek.Saturday);
    }
    return current;
}

请注意，如果您传入的天数= 0，即使是在周末，也会返回原始日期。目前尚不清楚你是否想要这种行为，或者它是否应该跳到星期一。

Answer 4

  This is your code... Try.. 

        int days = 0;
        DateTime deyt = DateTime.Now;
        DateTime dt = deyt.AddDays(int.Parse(textBox3.Text));

        DateTime span = deyt;
        while (span <= dt)
        {
            if (span.DayOfWeek != DayOfWeek.Saturday && span.DayOfWeek != DayOfWeek.Sunday)
            {
                days++;
                bd.Text = days.ToString();
                Console.WriteLine(span.ToString("MM/dd/yy"));
            }
            span = span.AddDays(1);
        }

不要在日期时间包括周末

4 个答案: