I created a simple SharePoint list and I am having problem with a calculated field. I have a "Duration" field that calculates the minutes between the start and end date/time columns, using the formula:
=INT(([RRT End (EST)]-[RRT Start (EST)])*1440)
The odd thing is it works correctly if the difference in minutes is 62 or above, but 61 or below it returns an incorrect (-1) result. It does not seem to be tied to the dates themselves, It only happens if the difference is 61 minutes or less. See below.
Any idea how to fix without using a workaround IF formula?