Duration returns a formatted string.

[c0dezer019]

Is your feature request related to a problem? Please describe.
The problem I face in my current project is developing a dynamic string such as 10 months, 24 days, 1 minute, and 25 seconds. that is grammatically correct and ignores values that are 0 (or adds if preferred to be more verbose about 0 values). The sentence should also be grammatically correct, swapping between singular and plural as needed.

Describe the solution you'd like
I have a two-fold solution.

Duration and diff practically return the same data. So I propose consolidating the functionality of .diff() into Duration. Instead of doing end.diff(start) you could do Duration(start, end).toDuration() which would perform the difference calculation and return the example I provided above. Coupled with current functionality, Duration.fromObject({}).toDuration() would return the same thing.

Describe alternatives you've considered

Additional context
Add any other context or screenshots about the feature request here.

[icambron]

ignores values that are 0 (or adds if preferred to be more verbose about 0 values)

I think #1134 captures this well.

Duration and diff practically return the same data. So I propose consolidating the functionality of .diff() into Duration.

This is already true; diff() is a method on DateTime that returns a Duration object. So I'm not really sure what's being proposed here?

Instead of doing end.diff(start) you could do Duration(start, end).toDuration() which would perform the difference calculation and return the example I provided above

You can already do this with Interval: Interval.fromDateTimes(start, end).toDuration() though it is semantically equivalent to end.diff(start)