const time = new Intl.DateTimeFormat(undefined, {
  hour: "2-digit",
  minute: "2-digit",
});
const day = new Intl.DateTimeFormat(undefined, {
  day: "numeric",
  month: "short",
});
const full = new Intl.DateTimeFormat(undefined, {
  day: "numeric",
  hour: "2-digit",
  minute: "2-digit",
  month: "short",
  year: "numeric",
});

export function formatTime(iso: string): string {
  return time.format(new Date(iso));
}

export function formatDay(iso: string): string {
  return day.format(new Date(iso));
}

export function formatFull(iso: string): string {
  return full.format(new Date(iso));
}

export function formatListDate(iso: string | null): string {
  if (!iso) {
    return "";
  }
  const date = new Date(iso);
  const now = new Date();
  if (date.toDateString() === now.toDateString()) {
    return time.format(date);
  }
  return day.format(date);
}