fix2

du3/program.c

@@ -7,7 +7,7 @@
 
 int main() {
     char buffer[20];
-    struct tm tm;
+    struct tm tm = {0};
 
     char *retval = fgets(buffer, sizeof(buffer), stdin);
 
@@ -23,8 +23,11 @@ int main() {
         return 0;
     }
 
+    tm.tm_isdst = -1;
     tm.tm_mday += 7;
 
+    mktime(&tm);
+    
     strftime(buffer, sizeof(buffer), "%e.%m.%-Y", &tm);
     puts(buffer);
     putc('\n', stdout);