Why don't astronomers use everyday units to measure distances (what is an AU or a pc)? (Intermediate)
How this formula works: The WEEKNUM function takes two arguments, a date, and, optionally, an argument called return_type, which controls the scheme used to calculate the week number. See the WEEKNUM page for more information. B4 contains a date value for January 5, 2016. The DAY function returns the number 2 representing the calculated week number. Note that by default, the WEEKNUM function uses a scheme where week 1 begins on January 1, and week 2 begins on the next Sunday (when the return_type argument is omitted, or supplied as 1).
Excel: Returning Week Number. Excel is often used to work with Dates and it's well suited to do so. See how Excel stores dates & times . One common request is to use Excel to add any desired number of months to a date. For example, if A1 houses the date 31-Aug-2005 you may wish to add (or take) 1 month to that date.