export const TZ_STORAGE_KEY = "apothecary.timezone";

const enCA = (tz: string) =>
  new Intl.DateTimeFormat("en-CA", {
    timeZone: tz,
    year: "numeric",
    month: "2-digit",
    day: "2-digit",
  });

export function getToday(tz: string): string {
  return enCA(tz).format(new Date());
}

export function getBrowserTimezone(): string {
  return Intl.DateTimeFormat().resolvedOptions().timeZone;
}

export function getStoredTimezone(): string {
  return localStorage.getItem(TZ_STORAGE_KEY) || getBrowserTimezone();
}