Question

我只是想利用这个TimePeriod库。我刚发现了一些我不确定是正确的东西，但我无法将其标记为错误。只需要澄清一下。

Dim xDateDiff As New DateDiff(New Date(2011, 1, 1), New Date(2011, 2, 1))
Console.WriteLine("Week Count : " + xDateDiff.Weeks().ToString()

现在，周计数输出为5，如果您看到公历，则两个日期之间为6周。周数是从零开始的吗？这令我不安。

请帮忙。

Answer 1

我从未使用过TimePeriod库，但这不仅仅是两个日期之间存在5周的差异，但如果包含第一周，则有6周的时间吗？我的观点是，你不能只做xDateDiff.Weeks() + 1吗？

Answer 2

DateDiff 类旨在表示两个日期的UI友好差异。周属性仅计算已完成的周数。

如果要计算两个日期之间所涉及的周数，您可以使用以下代码：

// ----------------------------------------------------------------------
public void InvolvedWeekCount()
{
  Console.WriteLine( "Involved week count: " +
    CalcInvolvedWeekCount( new DateTime( 2011, 1, 1 ), new DateTime( 2011, 1, 2 ), DayOfWeek.Sunday ) );
  // > Involved week count: 2
  Console.WriteLine( "Involved week count: " +
    CalcInvolvedWeekCount( new DateTime( 2011, 1, 2 ), new DateTime( 2011, 1, 8 ), DayOfWeek.Sunday ) );
  // > Involved week count: 1
  Console.WriteLine( "Involved week count: " +
    CalcInvolvedWeekCount( new DateTime( 2011, 1, 1 ), new DateTime( 2011, 1, 29 ), DayOfWeek.Sunday ) );
  // > Involved week count: 5
  Console.WriteLine( "Involved week count: " +
    CalcInvolvedWeekCount( new DateTime( 2011, 1, 1 ), new DateTime( 2011, 1, 30 ), DayOfWeek.Sunday ) );
  // > Involved week count: 6
  Console.WriteLine( "Involved week count: " +
    CalcInvolvedWeekCount( new DateTime( 2011, 1, 1 ), new DateTime( 2011, 2, 1 ), DayOfWeek.Sunday ) );
  // > Involved week count: 6
} // InvolvedWeekCount

// ----------------------------------------------------------------------
private int CalcInvolvedWeekCount( DateTime date1, DateTime date2, DayOfWeek firstDayOfWeek )
{
  if ( date1.Date.Equals( date2.Date ) )
  {
    return 0;
  }

  DateTime startWeek = TimeTool.GetStartOfWeek( date1, firstDayOfWeek );
  DateTime endWeek = TimeTool.GetStartOfWeek( date2, firstDayOfWeek ).AddDays( TimeSpec.DaysPerWeek );

  return (int)( endWeek.Subtract( startWeek ).TotalDays / TimeSpec.DaysPerWeek );
} // CalcInvolvedWeekCount

Answer 3

你的问题假设是虚假的。 2月1日是在1月1日之后的31天。31/7只是不到4个半月，所以2月1日是在1月1日之后的第五周。你如何得出6作为预期答案？

使用TimePeriod库（CodeProject）的周计数问题

3 个答案: