It will default to Thursday and, since we are using the ISO weeknumber system, should always fall within the current year. Code: Sub StartEndDate () MsgBox Date - WorksheetFunction.Weekday (Date, 3) MsgBox Date - WorksheetFunction.Weekday (Date, 11) + 7 End Sub. DOW is an optional argument representing the day of the week. If you want start and end dates of current week Mon-Sun try these. Credits to these guys: Solution 3Īs an additional option, for those using the ISO weeknumber system, where Week 1 of the year is the first week of the year containing four days (or the week that includes the first Thursday of the calendar year, and the first day of the week is Sunday. You have to pass which day do you want as third parameter. Code Sub WeekDate () Dim InputDate As Date Dim week As Long InputDate Now 'Change to desired date/cell week (InputDate) Debug. We can pass this date to the Weekday () function and it returns the number of day as a whole number. 1 Answer Sorted by: 2 To get week from Date Input a date and get the week number for this date. For example, we want to know what is Weekday (Sat, Sun, Mon, etc.) for the date 1 st Jan 2000. It works quite ok, taking in mind that the first day of the week is Sunday: Function fnDateFromWeek(ByVal iYear As Integer, ByVal iWeek As Integer, ByVal iWeekDday As Integer)įnDateFromWeek = DateSerial(iYear, 1, ((iWeek - 1) * 7) + iWeekDday - Weekday(DateSerial(iYear, 1, 1)) + 1) What is Weekday function in VBA The Weekday function returns the number of day of the Week for the given date. GetDayFromWeekNumber = DateAdd("ww", WeekNumber - 1, DateSerial(InYear, 1, i)) 'Function will return if you don't use a good DayInWeek1Monday7Sundayĭo While Weekday(DateSerial(InYear, 1, i), vbMonday) DayInWeek1Monday7Sunday "DayInWeek1Monday7Sunday!", vbOKOnly + vbCritical MsgBox "Please input between 1 and 7 for the argument :" & vbCrLf & _ Optional DayInWeek1Monday7Sunday As Integer = 1) As Date Or use the below function GetDayFromWeekNumberĭebug.Print Format(GetDayFromWeekNumber(2017, 1, 4), "ddd d MMM yyyy")Īnd the generic function GetDayFromWeekNumber : Public Function GetDayFromWeekNumber(InYear As Integer, _ If others are looking into this and don't want a Thursday or don't work on 2017 : Number of the week in the year that occurs, based on a week beginning on Monday (the second argument, 2).For a specific year, you can do it like this : DateAdd("ww", WeekNumber - 1, DateSerial(2017, 1, 5))Īnd to test it : Debug.Print Format(DateAdd("ww", WeekNumber - 1, DateSerial(YearNumber, 1, 5)), "ddd d MMM yy") Number of the week in the year that occurs, based on weeks beginning on Sunday (default). If you need to, you can adjust the column widths to see all the data. For formulas to show results, select them, press F2, and then press Enter. If Return_type is out of the range specified in the table above, a #NUM! error is returned.Ĭopy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. If Serial_number is out of range for the current date base value, a #NUM! error is returned. The ISO standard is for week 1 to be the one containing 4 days of January, or the first Thursday of the year (different ways of expressing the same thing). Januis serial number 39448 because it is 39,448 days after January 1, 1900. The TRUE and FALSE values are multiplied by amounts. Since weeks contains all 12 values, the result is an array with 12 TRUE and FALSE results. Inside the SUM function, this value is compared to weeks. The default is 1.Įxcel stores dates as sequential serial numbers so they can be used in calculations. You can use the following basic syntax in VBA to convert a date to a week number: Sub FindWeekNumber () Dim i As Integer For i 2 To 9 Range ('B' & i) WorksheetFunction.WeekNum (Range ('A' & i)) Next i End Sub. At each row, it applies this calculation: LAMBDA ( r, SUM (( weeks r) amounts)) The value for r is the week number in the 'current' row. A number that determines on which day the week begins. Problems can occur if dates are entered as text. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. The WEEKNUM function is used in Excel to return the week number of a specific date in the year (a number between 1 and 54). Dates should be entered by using the DATE function, or as results of other formulas or functions. The WEEKNUM function syntax has the following arguments: This system is the methodology specified in ISO 8601, which is commonly known as the European week numbering system. System 2 The week containing the first Thursday of the year is the first week of the year, and is numbered as week 1. System 1 The week containing January 1 is the first week of the year, and is numbered week 1. There are two systems used for this function: For example, the week containing January 1 is the first week of the year, and is numbered week 1. Returns the week number of a specific date. This article describes the formula syntax and usage of the WEEKNUM function
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