Hi Jase,
As the EOMONTH function is a part of the Analysis Toolpak, you need to ensure it's loaded for it to work. To do so, follow these three steps:
1. From the Tools menu, select Add-Ins. Excel displays the Add-Ins dialog box
2. Make sure the Analysis Toolpak check box is selected (ticked)
3. Click OK
Hope this solves the issue.
Robert
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