OK, another thought (sorry):

@martinjuckes wrote:

> However, calendar formerly known as gregorian_utc, as described at the start 
> of this discussion, is not consistent with use of SI time units, and so could 
> not be used with standard name time.  I can't see how such a major step in 
> increased complexity can be justified.

I think this is being kind pedantic: in this case, a second is still a second, 
but the times are not (to use Jim's word) "metric". I agree that the raw values 
probably shouldn't be used as a usual time axis. This is what I call "prone to 
hidden errors" rather than "not SI units" :-)

> What is described here has no relation to the concept of calendar as it 
> currently exists in the CF convention.

au contraire: a "calendar" is a way to translate from 
time-passed-from-a-timestamp to another timestamp. (timestamp being year,day, 
month, minute, second) -- so I think it fits.

> Why are you not prepared to consider working with the structures we have?

It's actually the opposite -- we have a real use-case to solve, and Jim's 
proposal is a way to jam it inot the existing structures. Hence my proposal to 
create a new structure.

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