1 files changed, 5 insertions, 0 deletions
diff --git a/src/Q6/WeekDay.java b/src/Q6/WeekDay.java
index 08233b0..31d90b4 100644
--- a/src/Q6/WeekDay.java
+++ b/src/Q6/WeekDay.java
@@ -8,6 +8,7 @@ public class WeekDay {
   private static final int[] MONTHS = new int[] {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
   public String getWeekDay(int day, int month, int year) {
+    this.ensureValidDate(year, month, day);
     return DAYS[daysSinceEpoch(day, month, year) % 7];
   }
 
@@ -32,6 +33,10 @@ public class WeekDay {
     return MONTHS[month - 1];
   }
 
+  private void ensureValidDate(int year, int month, int day) {
+    if (day > MONTHS[month - 1]) throw new IllegalArgumentException();
+  }
+
   public static void main(String[] args) {
     Scanner in = new Scanner(System.in);