Chris showcases Timestamp (gh.io/timestamp), an open-source countdown timer app that evolved from the 2025 holiday streams into a fully extensible project with multiple themes, comprehensive testing, and GitHub automation.

Timestamp — Open Source Countdown Timer

The app is built with vanilla TypeScript and Vite, featuring:

  • Multiple themes — contribution graph (GitHub-style squares that fill as midnight approaches), fireworks celebration (powered by fireworks.js), and a scaffoldable ring theme
  • World map wall clock — an interactive SVG map using Natural Earth public domain data with day/night visualization
  • Time zone support — countdown to midnight in any city worldwide with a drop-down and map selector
  • Light/dark mode — system-aware theme switching with per-theme styling
  • Accessibility — built-in reduced motion support, keyboard navigation, and WCAG considerations

Copilot Custom Instructions vs Agents vs Prompt Files

Chris shares key lessons learned from structuring his Copilot configuration:

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