Calendar Types

[Bayley, Alistair]

> From: Ketil Malde [mailto:ketil+haskell at ii.uib.no] 
> 
> You also need to specify, or let the user specify, the order of
> arithmetic.  I.e. adding a day and then a second is different from
> doing it the other way around.


Duration arithmetic is not commutative? Can you give some examples please,
because I'm not able to imagine any.

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