src/utils/time-format.ts

export function formatRelativeTime(timestamp: number): string {
  const now = Date.now();
  const diff = now - timestamp;
  const seconds = Math.floor(diff / 1000);
  const minutes = Math.floor(seconds / 60);
  const hours = Math.floor(minutes / 60);
  const days = Math.floor(hours / 24);

  if (seconds < 60) {
    return "just now";
  }
  if (minutes < 60) {
    return `${minutes}m ago`;
  }
  if (hours < 24) {
    return `${hours}h ago`;
  }
  if (days === 1) {
    return "Yesterday";
  }
  if (days < 7) {
    return `${days}d ago`;
  }
  return new Date(timestamp).toLocaleDateString(undefined, { month: "short", day: "numeric" });
}