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spin box

It's OK to use spin box in content for a technical audience to describe a control that users can use to move, or spin, through a fixed set of values, such as dates.

Screenshot of the Duration field which has a clock icon next to it and a text field with arrows to set the desired value.

For a general audience, just discuss what the customer needs to do. If you need to refer to the control, refer to a spin box by its label.
Example
the Start time box