After reading that link I can appreciate that XKCD comic even more :-) The [cftime](http://github.com/Unidata/cftime) utility that I've worked on is quite primitive and will probably never be able to serve applications that require accounting for leap seconds. I agree that it is important to have some sort of calendar designation that signifies that this precision is needed, so that tools such as mine can return an error message, instead of an incorrect answer. **gregrorian_tai** or **proleptic_gregorian_tai** seem like perfectly acceptable names to me.
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