differenceInMonths
import { differenceInMonths } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";@example
// How many full months are between 31 January 2014 and 1 September 2014?
const result = differenceInMonths(new Date(2014, 8, 1), new Date(2014, 0, 31))
//=> 7
function differenceInMonths<DateType extends Date>(dateLeft: DateType | number | string, dateRight: DateType | number | string): number;