startOfQuarter
import { startOfQuarter } from "https://esm.sh/v135/date-fns@3.6.0/index.d.mts";@example
// The start of a quarter for 2 September 2014 11:55:00:
const result = startOfQuarter(new Date(2014, 8, 2, 11, 55, 0))
//=> Tue Jul 01 2014 00:00:00
function startOfQuarter<DateType extends Date>(date: DateType | number | string): DateType;