Here are my (minor) comments on the PR #315, based on my limited understanding 
of the existing CF implementations:

- Linking to Wikipedia (ISO_8601) is perhaps unwise, because we don't know how 
the article is going to change in the future, and the standard should be as 
standalone as possible (Wikipedia is not intended to be an authoritative 
resource on any topic). It would be better to link to either a specific version 
of the article, or link to the ISO 8601 standard instead.
- "BC" should perhaps be "BCE", which as I understand is the preferred term in 
science. I have found one occurrence of the term "BCE" in the current CF 
Conventions in Section 4.4.1, as part of a quote from the udunits(3) man page, 
and no occurrence of "BC".
- I think it would be good to define a "proleptic_julian" calendar in which 
date/times earlier than 1-1-1 0:0:0 years are allowed, in analogy with the 
"proleptic_gregorian" calendar.

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