My son wondered why we don’t have a more rational, decimal system for time. To explore the idea, we made a simple javascript clock implementing decimal time.

We chose a 20 hour day, rather than 10, because it makes the duration of an hour more similar to our current system, and therefore a bit more intuitive as a unit of time.

Time subdivisions

• 20 hours per day; each hour equals 72 standard minutes.
• 100 minutes per hour; each minute equals 43.2 standard seconds.
• 100 seconds per minute; each second equals 0.432 standard seconds.
  Midnight, 6am, noon, and 6pm align with the hours 0, 5, 10, and 15.