Excel WEEKNUM function Return_type

Question

The WEEKNUM function syntax has the following arguments:

WEEKNUM(serial_number,[return_type])

Return_type Optional. A number that determines on which day the week begins.

Please show an examples what's the difference between Return_type 2,11 and 21 ? Beacause i cant reproduce diff

Answer 1

Starting point: Reed the following link:

http://office.microsoft.com/en-001/excel-help/weeknum-HP005209337.aspx

and try with 5/5/12. You have 19 / 19 / 18 ...