I was able to get the formula to work as: =vlookup(a1,a10:b100,2,False)
I believe format for date in a1 must be consistant with format for dates in
a10:a100

"MH" wrote:

User trying to find the value on a certain date can enter that date (a1).
vlookup will search column A for the requested date and then return the
associated value that is in column b.... Column A10:a100 = dates. Column
B10:b100= values... =vlookup(a1,a10:b100,2) returns #N/A