Calculating the first or last day of the last, current, or future month

…In this worksheet called first day last day,…we've got a series of dates in column A.…Sometimes we need to calculate the last day of the previous month.…At other times the first day of the current month.…In this case we're talking about the billing dates in Column A.…So, there is a function in Excel called day.…If it's the first of any given month, for example, if it's October…1st, we can simply subtract oneto get to the End of the last month.…If it's the second day of October we subtract two dates.…

And so for any given date all we need to do, is to write a…formula to take that date and subtract from it the day of the current date.…And so there is a function in Excel called day, and it…will allow us to extract the day of the month from a date.…In this case the date's in cell A2.…So the day of A2 in this first example is 20.…If we take October 20th, no matter what the year and subtract…20 from it we will be at September 30th, there we are.…

That's going to work for all of these.…You can see case by case, these are all the last days of the…