I currently define "LOCALE_ID" on "en-US" this way: @NgModule({ providers: [{ provide: LOCALE_ID, useValue: "en-US" }, ...], imports: [...], bootstrap: [...] }) and it works pretty well. However, in order to test how dates look like in French, I replaced "en-US" by "fr-FR" and then I got the error: Missing locale data for the locale "fr-FR". I did some researches and I didn't find anything related to that. Are the locale for french included in the default package? Is it a different package? Do I have to create them by myself? Continue reading...