diff --git a/src/java/org/apache/poi/hssf/usermodel/HSSFDateUtil.java b/src/java/org/apache/poi/hssf/usermodel/HSSFDateUtil.java
index 0ba1dc4a67..607c675126 100644
--- a/src/java/org/apache/poi/hssf/usermodel/HSSFDateUtil.java
+++ b/src/java/org/apache/poi/hssf/usermodel/HSSFDateUtil.java
@@ -186,18 +186,6 @@ public class HSSFDateUtil
                 case 0x2d:
                 case 0x2e:
                 case 0x2f:
-                // Additional internal date formats found by inspection
-                // Using Excel v.X 10.1.0 (Mac)
-                case 0xa4:
-                case 0xa5:
-                case 0xa6:
-                case 0xa7:
-                case 0xa8:
-                case 0xa9:
-                case 0xaa:
-                case 0xab:
-                case 0xac:
-                case 0xad:
                     retval = true;
                     break;