Quote:
Originally Posted by melvin1942
I need to put a date in a column like 1/01/2016 and then use it to calculate the amount in another column.

Hi Melvin & Welcome to the Forum,
Can you share what you are trying to achieve?
If you put 1/1/2016 in a cell, in terms of a number it is 42370.
In Excel, time is calculated from 1/1/1900 which is equal to 1.
There have been 42370 since 1/1/1900
If you have...
A1 = 1/1/2016
A2 = 10/1/2016
A3 =A2A1
The result is 274
There are 274 days between 1/1/2016 to 10/1/2016

Sorry, just realized I may have misread your post
Maybe you want =SUMIF(A2:A20,E1,B2:B20)
where
A2:A20 = dates
B2:B20 = numbers
E1 = a date to search for