Scroll Box widget delta isn't acting as expected

I’m trying to make a scroll box that increases in increments of 1.

To do this i should set the delta of the spinbox to 1.

What I will say the bar looks as though it is moving in the correct increments however it is still returning float values on screen - Is this a bug, eg. is there a way to return integer values to the bar as I need whole numbers for a date.