Use this built-in only at the places where the desired format differs from the one normally used.
For the other places the default format should be set properly by the programmers, outside the templates.
Joda Time is like an iceberg, 9/10ths of it is invisible to user-code.
Many, perhaps most, applications will never need to see what's below the surface.
We then say a few words about the role of interfaces in the library design, which is a little different than the norm. Usage examples for instant are delayed until the following sections of the guide.
Examples for interval, duration and period may be found in the appropriate section in the "Key Concepts" part of the documentation.
(Programmers can read about defining such named formats here...) Warning!Joda-Time defaults to using the ISO calendar system (the calendar used by most of the business world) and the default time zone of your machine.These default values can be overridden whenever necessary.So we can safely assume that physical time passes uniformly. That's the way we have been measuring time forever: we use natural periodic events.For physical time there is no notion of "date" or "clock" or "second". Even the most scientific definition of today's "second" bases on that: Here the periodic events are the waves of (a very precise) electromagnetic radiation.