diff --git a/test/libpldm_utils_test.cpp b/test/libpldm_utils_test.cpp
index b391f79..a40aec1 100644
--- a/test/libpldm_utils_test.cpp
+++ b/test/libpldm_utils_test.cpp
@@ -65,4 +65,19 @@
     EXPECT_EQ(0x9999, dec2bcd16(9999));
     EXPECT_EQ(0x12345678, dec2bcd32(12345678));
     EXPECT_EQ(0x99999999, dec2bcd32(99999999));
+}
+
+TEST(TimeLegal, TimeLegal)
+{
+    EXPECT_EQ(true, is_time_legal(30, 25, 16, 18, 8, 2019));
+    EXPECT_EQ(true, is_time_legal(30, 25, 16, 29, 2, 2020)); // leap year
+
+    EXPECT_EQ(false, is_time_legal(30, 25, 16, 18, 8, 1960));  // year illegal
+    EXPECT_EQ(false, is_time_legal(30, 25, 16, 18, 15, 2019)); // month illegal
+    EXPECT_EQ(false, is_time_legal(30, 25, 16, 18, 0, 2019));  // month illegal
+    EXPECT_EQ(false, is_time_legal(30, 25, 16, 0, 8, 2019));   // day illegal
+    EXPECT_EQ(false, is_time_legal(30, 25, 16, 29, 2, 2019));  // day illegal
+    EXPECT_EQ(false, is_time_legal(30, 25, 25, 18, 8, 2019));  // hours illegal
+    EXPECT_EQ(false, is_time_legal(30, 70, 16, 18, 8, 2019)); // minutes illegal
+    EXPECT_EQ(false, is_time_legal(80, 25, 16, 18, 8, 2019)); // seconds illegal
 }
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