Sure, I can help you with that! What you need to do is to use an absolute reference for the cell containing the date. Here's how you can do it:

1. Select the cell containing the date that you want to keep static.
2. Press the F4 key on your keyboard. This will add dollar signs ($) to the cell reference, making it an absolute reference. For example, if your date is in cell A1, it will change from "A1" to "$A$1".
3. Now, when you drag the formula down the column, the date in the absolute reference cell will stay the same.

Alternatively, you can also manually add the dollar signs to the cell reference by typing them in. For example, if your date is in cell A1, you can change the formula from "" to "".