addQuarters
import { addQuarters } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";@example
// Add 1 quarter to 1 September 2014:
const result = addQuarters(new Date(2014, 8, 1), 1)
//=> Mon Dec 01 2014 00:00:00
function addQuarters<DateType extends Date>(date: DateType | number | string, amount: number): DateType;