Excel and Filemaker calculates the difference between two dates differently. I always thought that when you subtract two date from one another, the result was the number of full days between the dates.
For example: Calculate the difference between 1/15/19 – 1/9/19.
There are 5 full days between these dates (10th, 11th, 12th, 13th, and 14th). However, FM and Excel calculations do not result in 5, and they don’t even agree with each other!
In Excel, Difference = 7
In FM, Difference = 6
It seems that when you subtract two dates in Excel the result includes the starting and ending dates and therefore it is not the number full days between the dates. In FM the result seems to include either the starting or ending date (not both), and therefore it also is not the number of full days between the dates.
What gives?