diff --git a/du3/program b/du3/program
index e021d85..dbf6ab6 100755
Binary files a/du3/program and b/du3/program differ
diff --git a/du3/program.c b/du3/program.c
index c6ffa0c..51482cc 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -33,13 +33,15 @@ int datevalid(int d, int m, int y) {
       return 0;
    }
 
-   if(m == 2) {
-      if(isleap(y)) {
-         if(d <= 29) {
-            return 1;
+   if (m == 2) {
+      if (isleap(y)) {
+         if (d > 29) {
+            return 0;
          }
       } else {
-         return 0;
+         if (d > 28) {
+            return 0;
+         }
       }
    }