Welcome to the Forum lucecal !
We need just a little more information to determine if this can be done with formulas, or if it requires VBA.
First, you refer to "free text." What do you mean by that? A cell containing a date should be a date value, not text.
When K1 is entered, does the user enter today's date, or can it be any date? If the user just enters today's date into K1 then your J1 formula can be
However, if K1 can contain any date at all, then you need to use VBA to fix the value in J1. This is not especially difficult but it will require converting your file to macro-enabled.
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