#### Is 4th January 2010 = Week 2??

```Dear all,

Happy New Year!

I am using the following formula to show week number
="WEEK " & WEEKNUM(NOW(),1)

However I notice today 4th January 2010 turns out to be WEEK 2 and the
correct WEEK number should be 1 instead.

Do you think there is something wrong with the formula?
Also how to show correct week number from a date like 4th January 2010 is
equal to W101 or 10W1?

Kind regards,
Ngin Hong
```
 0
Utf
1/4/2010 6:31:01 AM
excel.misc 78881 articles. 5 followers.

5 Replies
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```Look in Excek help for weeknum and you'll see why. If you want the ISO week
number use Chip pearson's function

Public Function IsoWeekNumber(InDate As Date) As Integer
Dim D As Long
D = DateSerial(Year(InDate - Weekday(InDate - 1) + 4), 1, 3)
IsoWeekNumber = Int((InDate - D + Weekday(D) + 5) / 7)
End Function

Mike

"nginhong" wrote:

> Dear all,
>
> Happy New Year!
>
> I am using the following formula to show week number
> ="WEEK " & WEEKNUM(NOW(),1)
>
> However I notice today 4th January 2010 turns out to be WEEK 2 and the
> correct WEEK number should be 1 instead.
>
> Do you think there is something wrong with the formula?
> Also how to show correct week number from a date like 4th January 2010 is
> equal to W101 or 10W1?
>
> Your support is greatly appreciated.
>
> Kind regards,
> Ngin Hong
```
 0
Utf
1/4/2010 11:42:01 AM
```Yes, with either of the options for Excel's WEEKNUM function, 4th Jan 2010
is in week 2.  Jan 1 was in week 1, and the new week starts on either Sunday
or Monday.

If you want a week number that is one less than Excel's week number, so that
January 1st is in week zero, you could use =WEEKNUM(TODAY())-1
If you want some different definition of week number, tell us your
definition and we can tell you the formula.
You may find some useful information at
http://www.cpearson.com/Excel/WeekNumbers.aspx or
http://www.rondebruin.nl/weeknumber.htm
--
David Biddulph

"nginhong" <nginhong@discussions.microsoft.com> wrote in message
news:AAC79F99-C737-41CE-B7F8-CDF6B98533F3@microsoft.com...
> Dear all,
>
> Happy New Year!
>
> I am using the following formula to show week number
> ="WEEK " & WEEKNUM(NOW(),1)
>
> However I notice today 4th January 2010 turns out to be WEEK 2 and the
> correct WEEK number should be 1 instead.
>
> Do you think there is something wrong with the formula?
> Also how to show correct week number from a date like 4th January 2010 is
> equal to W101 or 10W1?
>
> Your support is greatly appreciated.
>
> Kind regards,
> Ngin Hong

```
 0
David
1/4/2010 11:57:14 AM
```This one will do the trick for an ISO WEEK number in the cell:
=INT((L2-DATE(YEAR(L2-WEEKDAY(L2-1)+4);1;3)+WEEKDAY(DATE(YEAR(L2-WEEKDAY(L2-1)+4);1;3))+5)/7)```
 0
Tor
1/18/2010 12:27:58 PM
```Hi... But 03-Jan-2010 is week01 but when we apply the above mentioned formula it shows - week 53
```
 0
Suchitra
1/19/2010 4:06:57 AM
```this should work as well: =WEEKNUM(NOW()) -1
Hope this helps!```
 0
itsme
1/28/2010 9:42:47 AM

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