weeknum function says jan1=week1, mod to first 4 day week needed

[Guest]

using excel 2003 on xpSp2. i'm aware that MS says its normal that jan 1 is
week 1 when you're using the weeknum function. (in this year.only 1 day in
week1).. how does one modify this so that week 1 of the weeknum function is
the first 4 day week.. is there a mod i need to apply?

 

[Bob Phillips]

See Chip's site for an ISO weeknumber formula.
http://www.cpearson.com/excel/weeknum.htm

 

[JE McGimpsey]

See

http://cpearson.com/excel/weeknum.htm

 

[Ron de Bruin]

Hi Sam

See also
http://www.rondebruin.nl/isodate.htm

And
http://www.rondebruin.nl/weeknumber.htm