Return last day of the month

The most efficient way to return the last day of any month.

Let’s assume A1 has a date in it, and you want the last day of that month:


There is a slightly shorter method but it can only be used when/if the Analysis Toolpak is installed. That is, Tools>Add-ins and check Analysis Toolpak. Then you you can use the EOMONTH function as shown below