/**
 * Formats a date as a relative string: "Today", "Yesterday", "N days ago", or locale date.
 */
export function formatRelativeDate(date: Date): string {
	const now = new Date();
	const diff = now.getTime() - date.getTime();
	const days = Math.floor(diff / (1000 * 60 * 60 * 24));
	if (days === 0) return 'Today';
	if (days === 1) return 'Yesterday';
	if (days < 7) return `${days} days ago`;
	return date.toLocaleDateString();
}

/**
 * Formats a date as a short string like "Mar 12, 2026".
 */
export function formatShortDate(date: Date): string {
	return date.toLocaleDateString([], { month: 'short', day: 'numeric', year: 'numeric' });
}