How about:

=DATE((2000+INT(K2/1000)),0,MOD(K2,1000))
- DATE((2000+INT(J2/1000)),0,MOD(J2,1000))
+ 1

(all one cell.)

Just a tip.

It's better to give a small sample of your data in your initial post. It makes
things easier for possible responders.

saltrm wrote:

I got a value of "34391" when I applied the formula. Maybe I did
something wrong when applying?

=ABS(DATE(INT(J2)/1000+IF(J2<30000,2000,1900),1,MOD(J2,1000))
-DATE(INT(K2)/1000+IF(K2<30000,2000,1900),1,MOD(K2,1000)))

That the what I used

MY spreadsheet looks like this

J-2 K-2 L-2
4350 5310 Should read "325"

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Dave Peterson