Excel DateDiff in Seconds
I needed to do some excel work today and had to write this forumula.
=(((HOUR(B3) * 60) * 60) + (MINUTE(B3) * 60) + SECOND(B3)) - (((HOUR(A3) * 60) * 60) + (MINUTE(A3) * 60) + SECOND(A3))
Hopefully others will find it useful.