This is easy to remember.
You never have to make conversions to hours and minutes. A day is just 1.0, and half a day is 0.5. one hour is 0.1 of a day.
0.55678 of a day is 5 hours, 56 minutes and 78 seconds.
Add 6 hours to 9 hours and you get 1.5 days. Substract 1 hour from a day and you get 0.9 days.
100 seconds plus 100 minutes is 101 minutes, or 0.101 days, or 1 hour and 1 minute. Try this with standard time. If you think more than 5 seconds, you have failed already width standard time.
It's 1 o'clock. Meaning it's 1/10th of a day from midnight.
Opening hours are from .4 to .75 . This is equal to 9:36 - 18:00 in current standard time.
Standard 9:00 to 17:00 is about .375 to .708 in decimal time.
Lunch between .5 and .52, it's about half-hour in standard time
You can omit ceros from the end, and also be as precise as you want with subseconds.
No AM/PM rubbish.
Charge by hour or charge by minute, makes little difference. It is as simple as 100$ in an hour is the same as 1$ in a minute. In standard time you get confused if it is 100$ in an hour, how much it is for a minute? Anybody has a calculator? If there is 0.25 hours in your bill you can quess it is 15 minutes, but can you really be sure? Maybe they meant 25 minutes?
A day may be shorter like .95 or longer 1.05 or sometihing like that when there are those special days when we switch to or from summertime.
Leapseconds.
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