Copilot Enables Interactive New Year Countdown App

In the final Rubber Duck Thursdays livestream of 2025, the host used GitHub Copilot and custom agents to build an interactive New Year countdown targeting midnight January 1, 2026. The workflow combined a Vite/TypeScript/Tailwind stack, Plan and UI Performance Specialist agents for requirement discovery and reviews, and test-driven development with Copilot to handle time zones and a world-map selector. The episode demonstrates practical AI-assisted development patterns for developers.