@NonNull
    public static String formatDayOfWeek(final long date) {
        return DateUtils.formatDateTime(getContext(), date, DateUtils.FORMAT_SHOW_WEEKDAY);
    }
Generate a date string according to system-wide settings (locale, date format)
such as "Wednesday".

@param date milliseconds since the epoch
@return the formatted string
main/src/main/java/cgeo/geocaching/utils/Formatter.java