// From 2.12.0 onward moment.updateLocale('en', { weekdaysShort : String[] }); moment.updateLocale('en', { weekdaysShort : Function }); // From 2.8.1 to 2.11.2 moment.locale('en', { weekdaysShort : String[] }); moment.locale('en', { weekdaysShort : Function });

// Deprecated in 2.8.1 moment.lang('en', { weekdaysShort : String[] }); moment.lang('en', { weekdaysShort : Function });


Locale#weekdaysShort should be an array of the weekdays abbreviations.

moment.updateLocale('en', {
    weekdaysShort : ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
});

Locale#weekdaysShort can be a callback function as well.

moment.updateLocale('en', {
    weekdaysShort : function (momentToFormat, format) {
        return weekdaysShort[momentToFormat.day()];
    }
});