Decimal Time was officially introduced during the French Revolution on 5 October 1793:

«XI. The day, from midnight to midnight, is divided into ten parts, each part into ten others, and so forth until the smallest measurable portion of duration».

The main divisions are called decimal hours (or decidays). The hundredth part of a decimal hour is named decimal minute (or milliday), the hundredth part of a decimal minute is a decimal second (it depends on the proposal ―some suggest ‘wanidays’, ‘quintodays’, ‘myriadays’ or even ‘tolidays’― here we suggest microdays but working in a way like the milliseconds: using either 1 or 3 digits).

Here you will find all the links I’ve found on the internet about Decimal/Metric Time. From digital resources like digital clocks, analog clocks and demonstrations to history-centered links, clockshops, watchmakers, ¡and even sources on how make your own decimal clock!