Blank cell condition in formula

I have a formula working, but if K3 has a date in it and j3 is blank I get the serial of the date I want a blank in the cell

=IF(K3="",IF(J3<>"",IF(AND(DATEDIF(J3,TODAY(),"d")>=7,K3=""),"Chase Up",""),""),DATEDIF(J3,K3,"d"))

Thank you for any help

Ultimate Neo. You've been here for a while and have lots of posts. By now, you should realise that your title is too weak. If you had been doing a Google search for an answer.... what search term would you have used? That's what we expect to see, not your chosen title, which would yield a squillion useless hits.

Normally, I would lock the thread down and require you to make the change yourself. However, since you may already have an answer, that seems a bit pointless. However, do please take a moment to come up with a better title and change the thread title YOURSELF. If the answer is not what you need and you do not change the title, I WILL lock the thread UNTIL you make a suitable change.

UltimateNeo... thanks for making the change.