Peter Münster schrieb am 30.05.2024 um 23:22:
On Thu, May 30 2024, Wolfgang Schuster wrote:

The \date mechanism can only use conversions which are defined on the Lua side

Ok. How please?

This does not work:

--8<---------------cut here---------------start------------->8---
\startluacode
-- from https://wiki.contextgarden.net/Command/defineconversion:
   interfaces.implement {
     name      = "FRdate",
     public    = true,
     arguments = "string",
     actions   =
         function(s)
             local n = tonumber(s)
             if n == 1 then
                 context"1\\ier"
             else
                 context(s)
             end
         end
}
\stopluacode
\def\ier{\highordinalstr{er}}
\mainlanguage[fr]
\defineconversion[frd][\FRdate]
\setuplanguage[fr][date={day:frd,\ ,month,\ ,year}]
\starttext
Conversion: \convertnumber{frd}{1}, \convertnumber{frd}{2} (OK)\\
Dates: \date[d=1], \date[d=2] (not OK)
\stoptext
--8<---------------cut here---------------end--------------->8---


\startluacode
function converters.peter(n)
    return "X-" .. converters.romannumerals(n)
end
\stopluacode

\starttext

\date[d=1][X-,day:romannumerals]

\date[d=1][day:peter]

\stoptext

Wolfgang
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