diff --git a/lab24.py b/lab24.py
new file mode 100644
index 0000000..e921f22
--- /dev/null
+++ b/lab24.py
@@ -0,0 +1,31 @@
+# from lab23 import is_year_leap
+
+def is_year_leap(year):
+    if year % 4 == 0:
+        return True
+    else:
+        return False
+
+def days_in_month(year, month):
+
+    days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+
+    if is_year_leap(year) == True:
+        days[1] = 29
+
+    return days[month - 1]
+
+test_years = [1901, 2000, 2016, 1987]
+test_months = [2, 2, 1, 11]
+test_results = [28, 29, 31, 30]
+
+for i in range(len(test_years)):
+    yr = test_years[i]
+    mo = test_months[i]
+
+    print(yr, mo, "->", end="")
+    result = days_in_month(yr, mo)
+    if result == test_results[i]:
+        print("OK")
+    else:
+        print("Failed")
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