diff --git a/include/date/date.h b/include/date/date.h
index e2ab2b8..153f801 100644
--- a/include/date/date.h
+++ b/include/date/date.h
@@ -7755,11 +7755,11 @@ from_stream(std::basic_istream<CharT, Traits>& is, const CharT* fmt,
             if (j != not_a_doy && Y != not_a_year)
             {
                 auto ymd_trial = year_month_day{local_days(year{Y}/1/1) + days{j-1}};
-                if (m == 0)
+                if (m == not_a_month)
                     m = static_cast<int>(static_cast<unsigned>(ymd_trial.month()));
                 else if (month(static_cast<unsigned>(m)) != ymd_trial.month())
                     goto broken;
-                if (d == 0)
+                if (d == not_a_day)
                     d = static_cast<int>(static_cast<unsigned>(ymd_trial.day()));
                 else if (day(static_cast<unsigned>(d)) != ymd_trial.day())
                     goto broken;