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#96: Julian/Gregorian calendar name and constraints
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Reporter: Dave.Allured | Owner: cf-conventi...@lists.llnl.gov
Type: enhancement | Status: new
Priority: medium | Milestone:
Component: cf-conventions | Version:
Resolution: | Keywords: calendar time julian gregorian
udunits
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Comment (by jonathan):
Dear Dave
Thanks for the clarification. At the start of the ticket you describe the
new calendar name as a synonym and an alternative name. I understand now
that the proposal is actually for a new calendar, not a synonym for an
existing calendar.
It would be fine to have a more informative and correct name for the
default calendar. However I wonder what would be achieved by introducing a
new, more restrictive, version of that calendar. We would like to disallow
use of years before year 1 (except for the COARDS climatological time
convention, which we could deprecate), and we would like recommend against
using a reference date which is before (or within) the transitional period
if the time coordinates are all after the transitional period, because
both of these are problematic with the udunits calendar. But a person who
is aware that these give problems would not use them with the default
calendar, I guess, and therefore does not need a new calendar to
prevent/deprecate their use. On the other hand, a person who is unaware of
the problems will also be unaware of the new restrictive calendar, and so
will not use it. Hence I am not convinced this would really help in the
end. Have I missed the point?
It seems to me that to prevent the problems we actually need to change the
default calendar, as previously discussed. I think it would be tolerable
to do that so long as the new default has the same interpretation as the
old default for any time units and coordinates that remain legal i.e. the
effect of the changed definition is only to make some things illegal or
deprecated.
Best wishes
Jonathan
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Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/96#comment:5>
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