Getting week of the month from a DateTime variable?
Hello,
How do I get the week number of the month a DateTime value falls under? For example, March 3, 2007 would be in week 1 and March 4, 2007 would be in week 2
thx
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Totenkopf
3/27/2007 7:51:00 PM
asp.net.getting-started
91979 articles. 
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theres no native week of month function. The closest you can get is GetWeekInYear , which you can pass the 1st day of the month, along with the day of week that the week starts on. You can then loop, adding 7 days to the date to calculate the other weeks in the month.
Cathal
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cathal
3/27/2007 8:42:24 PM
http://groups.google.com/group/microsoft.public.access/msg/996e69eb76a63f76
Wayne Morgan wrote: > This one is a little simpler. > Public Function WeekOfMonth(dteInputDate As Date) As Integer > Dim intDate As Integer > intDate = Day(dteInputDate) > WeekOfMonth = (intDate \ 7) + 1 + (intDate Mod 7 = 0) > End Function Here's a more general version: Public Function WeekOfMonth(dteInputDate As Date, intStartWeekday As Integer) As Integer Dim intWeekdayOf1st As Integer Dim intDaysInWeek1 As Integer Dim intDaysPastWeek1 As Integer intWeekdayOf1st = WeekDay(DateSerial(Year(dteInputDate), Month(dteInputDate), 1)) intDaysInWeek1 = (6 + intStartWeekday - intWeekdayOf1st) Mod 7 + 1 If Day(dteInputDate) <= intDaysInWeek1 Then WeekOfMonth = 1 Else intDaysPastWeek1 = Day(dteInputDate) - intDaysInWeek1 WeekOfMonth = 1 + (intDaysPastWeek1 \ 7) + Abs(intDaysPastWeek1 Mod 7 <> 0) End If End Function Note: This function can be shortened slightly by using the Ceiling(X) = - Int(-X) function posted by Van T. Dinh: WeekOfMonth = 1 - Int(-intDaysPastWeek1 / 7) When used in a query, use the weekday numbers (Sunday = 1, ..., Saturday = 7) directly instead of vbSunday, ..., vbSaturday. It counts the days during the month before the first starting weekday, if any, as week 1. Also, see the technique used in: http://groups.google.com/group/microsoft.public.access/msg/c777af0e1f... Note: The Ceiling function can similarly simplify the expression used there. James A. Fortune
Please remember to "mark as answered" posts that have helped you.
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http://lsudotnet.blogspot.com
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LSU
3/27/2007 8:46:00 PM
// ---- GetWeekOfMonth --------------------------- // // Assuming Sunday starts a new week, get the ordinal // week a date is in...of the date's month // using Microsoft.VisualBasic; int GetWeekOfMonth(DateTime Date) { long Week; // get first day of month DateTime BaseDate = new DateTime(Date.Year, Date.Month, 1); // get difference, in weeks, between the date and first day of month Week = DateAndTime.DateDiff(DateInterval.WeekOfYear, BaseDate, Date, Microsoft.VisualBasic.FirstDayOfWeek.Sunday, FirstWeekOfYear.Jan1); // want it one, not zero based return (int)Week + 1; } // test it protected void Button1_Click(object sender, EventArgs e) { DateTime Date = new DateTime(2007, 3, 1); while (Date.Month == 3) { int Week = GetWeekOfMonth(Date); Response.Write(String.Format("{0:d} : {1} <BR>", Date, Week)); Date = Date.AddDays(1); } }
Steve Wellens
My blog
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SGWellens
3/27/2007 9:45:29 PM
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