I need to calculate the number of days between when a report was run and the
time before. That is straightforward (R7 - R8) except when the previous date
is repeated over and over again. In other words, I need a running total.
But, if the last time it was run was Sep 08 and the cell below that says Sep
08, the difference between those cells is 0. The number of elapsed days
should build from month-to-month.

DOUG