I'm fairly proficient in using vlookups, but I'm having an issue vlooking up dates between two different spreadsheets.
=VLOOKUP(B6,'[example.xlsx]Sheet1'!$B$1:$AA$260, 19, FALSE)
My formula is retrieving a date fine, but the date is different when the cell is formatted for a date. Yet, when I change the formatting on each spreadsheet to display the date as a number, the number is the same (40115). The dates are displaying differently in each spreadsheet and I can't figure out why, they differ by about 3 years and 1 day (10/30/13 vs. 10/29/09). One was previously .xls, but I saved both a .xlsx.