Next.js revalidation strategy for routes associated with dates

getRevalidationStrategyByDay.ts

import { differenceInCalendarDays } from "date-fns";

const buildDate = new Date();

// starting at 1 minute, add a minute to the revalidation
// for each additional day in the past/future.
// for example, a page associated with a date today, tomorrow or yesterday would refetch when stale by a minute.
// one a week in the past or future would only revalidate every 7 minutes,
// and one a month out would revalidate on the half hour.
// the assumption here is that events, posts and other entities with
// times attached to them are modified more frequently near to the time in question.
// top out at 2 hours.
export default function getRevalidationStrategyByDay(
	year: string,
	month: string,
	dayOfMonth: string
) {
	const distance = Math.abs(
		differenceInCalendarDays(
			buildDate,
			new Date(
				Number.parseInt(year, 10),
				Number.parseInt(month, 10) - 1,
				Number.parseInt(dayOfMonth, 10)
			)
		)
	);
	const revalidate = Math.min(7200, Math.max(1, distance) * 60);
	return revalidate;
}