Hi Jonathan:
On 12/17/2012 10:51 AM, Jonathan Gregory wrote:
> Dear John
>
>> I have prototyped similar functionality in the CDM, documented here:
>>
>> http://www.unidata.ucar.edu/software/netcdf-java/CDM/CalendarDateTime.html
> Thanks for this. I recall the earlier discussion and I think what you have
> implemented would be a good extension to CF, namely
>
> * Optional prefix "calendar" to the time-units means the corresponding
> component of time is manipulated. You show only years and months. Do you
> also accept the unproblematic units of days, hours, minutes and seconds
> with "calendar" prefixed? Do you allow the SI prefixes to these units?
yes, the same periods are allowed that are in the udunits grammer:
period = "millisec" | "msec" | "second" | "sec" | "s" | "minute" | "min" | "hour" | "hr" | "day" | "week" | "month" | "mon" |
"year" | "yr"
we do not allow SI prefixes. we do allow plural forms, ie with an
appended s.
>
> * With calendar, only integer numbers of units are allowed. Are negative
> numbers allowed?
yes
>
> * Invalid dates caused by adding months and years are decremented in whole
> days until a valid date is reached.
yes
regards,
John
Received on Mon Dec 17 2012 - 11:12:47 GMT
