![]() It has two arguments, the 1 st is required and the 2 nd is optional: WEEKNUM (serialnumber, returntype) Serialnumber - any date within the week whose number you are trying to find. I'm almost certain this will break for some week at the end of some year-I just can't find that date yet. 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). 4 years equals 1461 days and 209 weeks equals 1463 days. Here's what I mean-you've essentially carved 4 years (365 + 365 + 365 + 366) into 209 weeks (52 + 52 + 52 + 53) and the math doesn't work on a day level. Again, it works for all the examples I've plugged into it, but I'm having a hard time convincing myself your definition works for every date. ![]() It will return a value like this: '53-2016'. Paste that into a module, then call it in a function like this: ' if WeekNum is 53 and not leap year, rolls over return value to next year If (WeekNum = 53) And (YearNum Mod 4 > 0) Then ' gets difference in weeks between DayOne and date passed (d) WeekNum = (DateDiff("ww", DayOne, d) + 1) ![]() Relative Articles: Get end of month date in Excel The Best Office Productivity Tools Kutools for Excel Solves Most of Your Problems, and Increases Your Productivity by 80. ' gets date of sunday in first week of year Tip: In the above formulas, A2 indicates the year cell, B2 is the week number cell. If Weekday(DayOne) > 1 Then ret = DateAdd("d", (Weekday(DayOne) - 1) * -1, DayOne) ' returns Week and Year number of date (d): Day 1 of Week is first Sunday on or before January 1stĭim DayOne As Date ' holds first date of year (Sunday on or before 1/1)ĭim YearNum As Integer ' holds Year number of dateĭim WeekNum As Integer ' holds week number of date IntWeek = DatePart("ww", datDate, vbSunday, vbFirstFourDays) Was right for 2013 but wrong for later dates. Except when it is a leap year where Week 53 exists. In this article, we will use Excel VBA to find the week number. The last sunday of Dec is the beginning of Week 1 for the following year. Week Number refers to the first complete week of the calendar year, which is Week No.1 and continues in numerical order until Week No. I need the code to define that there are 52 weeks in a year. So I have gone through all their records (im the new guy) for a few years and deciphered this pattern: My work colleagues do not not what system is used to define the week numbers. If you want start and end dates of current week Mon-Sun try these Code: Sub StartEndDate () MsgBox Date - WorksheetFunction. Im trying to write some VBA to convert a date into a week number.
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