@JonathanGregory said: > Re the question from @jswhit, I too asked about year zero in the proleptic > Gregorian calendar earlier. You said that year zero is conventionally allowed > in that calendar. I'm happy to take your word for that.
Careful, I don't think I actually said that. All that I said was "there is precedent for [including year zero] outside of CF; see the [Wikipedia article](https://urldefense.us/v3/__https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar__;!!G2kpM7uM-TzIFchu!jnO0BMCRGZd0CoernNZJEDvQ4gHdzA_TuMETt2xNQcvNuTvAn8XQ5vnYHwPuvhIM1lUUgtcMqIM$ )." If there was a universal governing standard for Proleptic Gregorian, this conversation would be easier. I have found no such standard. [ISO-8601](https://urldefense.us/v3/__https://en.wikipedia.org/wiki/ISO_8601__;!!G2kpM7uM-TzIFchu!jnO0BMCRGZd0CoernNZJEDvQ4gHdzA_TuMETt2xNQcvNuTvAn8XQ5vnYHwPuvhIM1lUUZpbEAfE$ ) certainly does not count; they are a latecomer to the Proleptic Gregorian party. Unidata/netCDF [has declined authority](https://urldefense.us/v3/__https://github.com/cf-convention/cf-conventions/issues/298*issuecomment-698019192__;Iw!!G2kpM7uM-TzIFchu!jnO0BMCRGZd0CoernNZJEDvQ4gHdzA_TuMETt2xNQcvNuTvAn8XQ5vnYHwPuvhIM1lUUNNVXDD8$ ). My sense is that there is a slow convergence within scientific and technical communities, on including year zero in the calendar called Proleptic Gregorian, for record keeping purposes. [Astronomical year numbering](https://urldefense.us/v3/__https://en.wikipedia.org/wiki/Astronomical_year_numbering__;!!G2kpM7uM-TzIFchu!jnO0BMCRGZd0CoernNZJEDvQ4gHdzA_TuMETt2xNQcvNuTvAn8XQ5vnYHwPuvhIM1lUUKKSGJWQ$ ) is the most long standing example. My opinion is that CF should join this trend. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://urldefense.us/v3/__https://github.com/cf-convention/cf-conventions/issues/298*issuecomment-809816162__;Iw!!G2kpM7uM-TzIFchu!jnO0BMCRGZd0CoernNZJEDvQ4gHdzA_TuMETt2xNQcvNuTvAn8XQ5vnYHwPuvhIM1lUUUcMgtoE$ This list forwards relevant notifications from Github. It is distinct from [email protected], although if you do nothing, a subscription to the UCAR list will result in a subscription to this list. To unsubscribe from this list only, send a message to [email protected].
