I'm in the middle of a query and need to subtract dates for days between appointments.  Some days will equal a negative number based on the dates.  I only wish to keep the positive numbers and the negative numbers I don't want to count.  I would really like to create a formula where if the number is a negative number it returns a zero or in power query I can change it to a zero in the cell.  Any ideas.  I created an additional column and subtracted one date column from another and change the type to a duration type.  Any assistance would be appreciated.

Thank You,

Gary