[NTG-context] tex.month can't be overridden like tex.day and tex.year

Dear list, in the following document I can set the date as seen by LuaTeX so the date functions use a different date: --- \starttext \ctxlua{tex.year=1980; tex.month=1; tex.day=15} % Taken from https://wiki.contextgarden.net/Command/date, % outputs 15 may 1980 \date[m=1][day,~,{\monthshort\normalmonth},~,year] % outputs January 15, 1980 \ctxlua{context.date{m=tex.month};} \stoptext --- This works for all parts of the date (even the weekday), except the month. I've looked through the core-con.lua and found nothing that would explain this (or what I'd need to change), as the tex.month is properly set. Best regards Tristan