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).
=(YEAR(A4)-YEAR(A3))*12+MONTH(A4)-MONTH(A3) Months occurring between two dates more than a year apart (15) Note: You can format the dates as numbers. Select the cell, and on the Home tab, in the Number group, click the arrow, and then click Number. For more information about how to use these functions, see MONTH function and YEAR function.