subWeeks
import { subWeeks } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";@example
// Subtract 4 weeks from 1 September 2014:
const result = subWeeks(new Date(2014, 8, 1), 4)
//=> Mon Aug 04 2014 00:00:00
function subWeeks<DateType extends Date>(date: DateType | number | string, amount: number): DateType;