The date/time library provides several implementations of date/time string conversion.
Unfortunately, none of these include formatted date/time conversions. In trying to
duplicate the functionality of VarFormat for dates, I can do so (relatively) easily
only in one way (from date to string), since each date component provides the
necessary to string conversion functions. But I can't construct a greg_month (which
is undocumented in the main documentation, btw), from a string. The short/long
strings are declared privately and so I must duplicate this functionality (and
constant strings) if I want to implement formatted input. While I could duplicate it
(cut/paste), I don't think I should need to. I think greg_month/greg_day/greg_year
should all export from_short_string, from_long_string, from_char, etc.
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