@ChrisBarker-NOAA This topic is only about real-world calendars. There are 
three different model calendars already - **`360_day`**, **`noleap`** (aka 
**`365_day`**), and **`all_leap`** (aka **`366_day`**). I think the model 
people have all they need. They can also use the current **`julian`**, 
**`gregorian`**, and **`proleptic_gregorian`** calendars if they so choose. 
They don't (shouldn't?) ever need to deal with leap seconds unless they are 
trying to match up against observational data, and even then I don't think many 
(any?) models have time resolutions where leaps seconds would matter.

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