If Statement + Find & Replace

I have a pieces of code I know (or at least strongly suspect) is not the most efficent way of doing this action:

I have an IF statement that looks at a range of date, and if the previous month is not January, run code, and if it is January, run very similar code.
This code runs as desired, but wondering if there is a more efficient way to achieve the results

Here is what I have:

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This works great. I was thinking along the lines of testing the date before doing the find and replace.
This is great, thank you for your help!