I have a start date (example 12/25/18)

I have an end date (example 12/26/18)

I need to find out how many days that is total.

I used this:

DATETIME_DIFF(Date1,Date2,‘days’)

and it came up with 1 (26-25=1, however that is accurate as it needs to be 2, since it is the 25th & the 26th.