vb.net 获取从 VB 中的给定日期开始计算的一年中的周数
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Get the week number of the year counting from a given date in VB
提问by user1717576
In vb we can get the week number counting from January. ex Jan 1st is Week 1 and Feb 1st is Week 5 etc by .DatePart(DateInterval.WeekOfYear, Now)
在 vb 中，我们可以得到从一月开始计算的周数。前 1 月 1 日是第 1 周，2 月 1 日是第 5 周等，通过 .DatePart(DateInterval.WeekOfYear, Now)
I need to count the week number from a given date. ex: if set the base to July 1st then July 1st is the week 1 and based on that what would be the week number for Oct 3rd? How can I do this in VB?
我需要计算给定日期的周数。例如：如果将基数设置为 7 月 1 日，那么 7 月 1 日是第 1 周，基于此，10 月 3 日的周数是多少？我怎样才能在VB中做到这一点？
回答by Jodrell
You can use Calendar.GetWeekOfYear.
您可以使用Calendar.GetWeekOfYear.
Here's an example
这是一个例子
Dim dateNow = DateTime.Now
Dim dfi = DateTimeFormatInfo.CurrentInfo
Dim calendar = dfi.Calendar
' using Thursday because I can.
Dim weekOfyear = calendar.GetWeekOfYear(
dateNow, _
dfi.CalendarWeekRule, _
DayOfWeek.Thursday)
回答by Steven Doggart
Something like this should do the trick:
像这样的事情应该可以解决问题：
Private Function GetWeekNumber(ByVal startMonth As Integer, ByVal startDay As Integer, ByVal endDate As Date) As Integer
Dim span As TimeSpan = endDate - New Date(endDate.Year, startMonth, startDay)
Return (CInt(span.TotalDays) \ 7) + 1
End Function
