Decimal time: you divide the day into powers of tens, a 'deci' is 2.4 hours, a 'centi' is 14.4 ~= 15 minutes, a 'mili' is 1.44 minutes ~= 86 seconds and so on.
Great system with convenient lengths, and easy to add duration + date, and convert between different units.
Of course it is not insurmountable problem, but for lot of other units milli- tends to represent the lower end of "human scale"; millimeters, milligrams, milliliters, milliwatts, etc are as small as most people will ever use in day-to-day life.
In some ways it would be more convenient if the base unit would be e.g. 1e-4 days (or some other power of 10) so day would be 10 kilos. Understandably it would be lot less elegant but more practical. Deci- would be .86 seconds which is kinda nice.
Edit: Swatch internet time
There is "Swatch Internet Time" which is UTC+1. (Wiki never refers that time as Internet Time, good that they couldn't take the term for their time.)
It seems "Internet time" is still free for someone to take, if they can.
https://en.wikipedia.org/wiki/Decimal_time
Not to be confused with Metric Time:
https://en.wikipedia.org/wiki/Metric_time
Timekeeping units of measurement: