public static String getGcCustomDate() {
        // We might have some users whose stored value is null, which is invalid. In this case, we use the default.
        return StringUtils.defaultString(getString(R.string.pref_gccustomdate, GCConstants.DEFAULT_GC_DATE),
                GCConstants.DEFAULT_GC_DATE);
    }
@return User selected date format on GC.com
main/src/main/java/cgeo/geocaching/settings/Settings.java