@jswhit There are no leap seconds prior to - depending on your viewpoint - somewhere between 1958 to 1970, so **`gregorian_utc`** (**`new calendar a`**) collapses to **`gregorian`** for dates prior to that range. I have no preference over where that should be considered proleptic or not. I tend to think that a time series using the proleptic Gregorian calendar would not care about UTC as such.
What do you think? -- You are receiving this because you commented. Reply to this email directly or view it on GitHub: https://github.com/cf-convention/cf-conventions/issues/148#issuecomment-435417291
