Difference between dates

I'm looking to work out the average time in days from 'Instructed' to 'Completed' (both dates), I'm using DateDiff but the returned value is -151 for some reason. Is there something I am doing wrong with this formula?


  • Likely you're swapping the order of the parameters. If you reverse the order it should get you a positive number. The order is backwards where it expects the end date as the first parameter and the start date as the second parameter.

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