Yes you can.
Roadmunk uses your browser's Languages Settings to determine the format to apply to dates. For example, if you select English (Canada) as the Chrome display language, Chrome will format dates using the date format used in Canada. If the language you want to select is not listed, you can add it. For more help, see Change Chrome languages and translate webpages in Google Chrome Help.
TIP: If you need to change a roadmap's year-end, see Change a roadmap's year-end.