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---

-- 
           Peter
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