Function previousDay

pkgs/core/src/previousDay/index.ts:39–51

(
  date: DateArg<DateType>,
  day: Day,
  options?: PreviousDayOptions<ResultDate> | undefined,
)

 * //=> Tue Mar 17 2020 00:00:00
 */
export function previousDay<
  DateType extends Date,
  ResultDate extends Date = DateType,
>(
  date: DateArg<DateType>,
  day: Day,
  options?: PreviousDayOptions<ResultDate> | undefined,
): ResultDate {
  let delta = getDay(date, options) - day;
  if (delta <= 0) delta += 7;

  return subDays(date, delta, options);
}