With Xojo 2017.2.1 the application displays the date format in English, although the Regional and Language Settings on Mac are set to French. This happens since I installed Mojave.
Thanks for your reply. Yes French is listed as first language and in Advanced the date settings are in French. If I test in other applications such as Pages, the date displays in French. But this is not the case with my app made with Xojo. As already stated, this problem appears only in Mojave.