Change the “day” label of the date result to “night”

Hi! guys,

I’m wondering how to change the label of the date result from “day” to “night”.

For example, instead of 11/02/2021 – 11/03/2021 (1 day),
it will become 11/02/2021 – 11/03/2021 (1 night).

instead of 11/02/2021 – 11/04/2021 (2 day),
it will become 11/02/2021 – 11/04/2021 (2 night).