Will this work in the Custom Header?

"galimi" wrote:

=if(a1<a2,a1-1,a1-3)

Assuming a1 & a2 contain date values, you can simply subtract the number of
days from a date.
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"Wink20TCU" wrote:

Is there a way to modify the date in an Excel Header? I would like to use an
IF function to subtract one or three days depending upon the current date.