helping-js/core/date.d.ts

helping-js: zero-dependency JavaScript utilities — type guards, 50+ regex patterns, validate(), TypeScript .d.ts, v3 helpers (string, array, object, async, date, URL, tree, DOM). Official docs: https://helping-js.netlify.app

export function cloneDate(d: Date): Date;
export function addDate(
  date: Date,
  delta?: { years?: number; months?: number; days?: number; hours?: number; minutes?: number; seconds?: number }
): Date;
export function getMonthStart(date: Date): Date;
export function getMonthEnd(date: Date): Date;
export function getCalendar(
  year: number,
  month: number
): Array<Array<{ date: Date; label: string } | null>>;
export function parseISO(str: string): Date | null;
export function isIsoFormat(str: unknown): boolean;