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 has several built in date functions that can be used to calculate the number of days between two dates. Each date function does a different job so that the results differ from one function to the next. Which one you use, therefore, depends on the results you want.or help with this example, see the image above. Since the DATEDIF function can be used to find either the number of days, the number of months, or the number of years between two dates, this example will show separately how to calculate all three between the dates of July 9, 2010 and November 2, 2012.