diff --git a/du3/program.c b/du3/program.c
index fb07489..4cd0450 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -17,10 +17,10 @@ if(m%2!=0 && day>31){
 }
 if(m%2==0 && day>30){
     if(m==2 &&(y%400==0 ||(y%100!=0 && y%4==0))){
-        day-=28;
+        day-=29;
     }
     else if(m==2){
-        day-=30;
+        day-=28;
     }
     else{
         day-=30;