addWeeks
import { addWeeks } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";@example
// Add 4 weeks to 1 September 2014:
const result = addWeeks(new Date(2014, 8, 1), 4)
//=> Mon Sep 29 2014 00:00:00
function addWeeks<DateType extends Date>(date: DateType | number | string, amount: number): DateType;