diff --git a/du3/program.c b/du3/program.c
new file mode 100644
index 0000000..fca5176
--- /dev/null
+++ b/du3/program.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define __USE_XOPEN
+#include <time.h>
+
+int main(int argc, char const *argv[]){
+
+	char str[50];
+	fgets(str, 50, stdin);
+	struct tm time;
+
+	if(strptime(str, "%d.%m.%Y", &time)==NULL){
+		printf("Nespravny datum\n");
+		return 0;
+	}
+
+int max;
+	switch(time.tm_mon+1){
+		case 2:
+			if((time.tm_year+1900)%4==0)
+				max=29;
+			else
+				max=28;
+			break;
+		case 4:
+		case 6:
+		case 9:
+		case 11:
+			max=30;
+			break;
+		default:
+			max=31;
+	}
+	if(time.tm_mday<1){
+		printf("Nespravny datum\n");
+		return 0;
+	}
+	if(time.tm_mday>max){
+		printf("Nespravny datum\n");
+		return 0;
+	}
+time_t pouprave = mktime(&time)+604800+3600;
+
+	strftime(str, sizeof(str), "%d.%m.%Y", localtime(&pouprave));
+	if(str[0]=='0'){
+		str[0]=' ';
+	}
+	printf("%s\n\n", str);
+	return 0;
+}