diff --git a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/AlternateAccessSelection.java b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/AlternateAccessSelection.java
index 095ad63..7401ca0 100644
--- a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/AlternateAccessSelection.java
+++ b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/AlternateAccessSelection.java
@@ -10,6 +10,7 @@ import java.io.OutputStream;
 import java.io.Serializable;
 import org.openmuc.jasn1.ber.*;
 import org.openmuc.jasn1.ber.types.*;
+import org.openmuc.jasn1.ber.types.string.BerVisibleString;
 
 public class AlternateAccessSelection implements Serializable {
 
diff --git a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedRequestPDU.java b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedRequestPDU.java
index 1538f8b..f20f19f 100644
--- a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedRequestPDU.java
+++ b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedRequestPDU.java
@@ -9,6 +9,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.Serializable;
 import org.openmuc.jasn1.ber.*;
+import org.openmuc.jasn1.ber.types.*;
 
 public class ConfirmedRequestPDU implements Serializable {
 
diff --git a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedResponsePDU.java b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedResponsePDU.java
index 34ed047..458b7ac 100644
--- a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedResponsePDU.java
+++ b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ConfirmedResponsePDU.java
@@ -9,6 +9,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.Serializable;
 import org.openmuc.jasn1.ber.*;
+import org.openmuc.jasn1.ber.types.BerInteger;
 
 public class ConfirmedResponsePDU implements Serializable {
 
diff --git a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/DeleteNamedVariableListRequest.java b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/DeleteNamedVariableListRequest.java
index 76123ba..530cc36 100644
--- a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/DeleteNamedVariableListRequest.java
+++ b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/DeleteNamedVariableListRequest.java
@@ -13,6 +13,7 @@ import java.util.Iterator;
 import java.io.Serializable;
 import org.openmuc.jasn1.ber.*;
 import org.openmuc.jasn1.ber.types.*;
+import org.openmuc.jasn1.ber.types.string.BerVisibleString;
 
 public class DeleteNamedVariableListRequest implements Serializable {
 
diff --git a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ObjectName.java b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ObjectName.java
index 941f8d2..bd4cf02 100644
--- a/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ObjectName.java
+++ b/src/main/java-gen/org/openmuc/openiec61850/internal/mms/asn1/ObjectName.java
@@ -9,6 +9,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.Serializable;
 import org.openmuc.jasn1.ber.*;
+import org.openmuc.jasn1.ber.types.string.BerVisibleString;
 
 public class ObjectName implements Serializable {
 
diff --git a/src/main/java/org/openmuc/openiec61850/BdaEntryTime.java b/src/main/java/org/openmuc/openiec61850/BdaEntryTime.java
index a0073fc..f34ba7b 100644
--- a/src/main/java/org/openmuc/openiec61850/BdaEntryTime.java
+++ b/src/main/java/org/openmuc/openiec61850/BdaEntryTime.java
@@ -57,8 +57,8 @@ public final class BdaEntryTime extends BasicDataAttribute {
         if (value.length != 6) {
             return -1;
         }
-        return ((value[0] & 0xffl) << 24) + ((value[1] & 0xffl) << 16) + ((value[2] & 0xffl) << 8) + (value[3] & 0xffl)
-                + (((value[4] & 0xffl) << 8) + (value[5] & 0xffl)) * 86400000l;
+        return (((value[0] & 0xffl) << 24) + ((value[1] & 0xffl) << 16) + ((value[2] & 0xffl) << 8) + (value[3] & 0xffl)
+                + (((value[4] & 0xffl) << 8) + (value[5] & 0xffl)) * 86400000l) + 441763200000l;
     }
 
     public void setValue(byte[] value) {
diff --git a/src/main/java/org/openmuc/openiec61850/ClientAssociation.java b/src/main/java/org/openmuc/openiec61850/ClientAssociation.java
index a1e874c..02daaf6 100644
--- a/src/main/java/org/openmuc/openiec61850/ClientAssociation.java
+++ b/src/main/java/org/openmuc/openiec61850/ClientAssociation.java
@@ -944,10 +944,13 @@ public final class ClientAssociation {
 
             long fileSize = entry.getFileAttributes().getSizeOfFile().longValue();
 
-            Calendar lastModified;
+            Calendar lastModified = null;
 
+            
             try {
-                lastModified = entry.getFileAttributes().getLastModified().asCalendar();
+            	
+            	if (entry.getFileAttributes().getLastModified() != null)
+            		lastModified = entry.getFileAttributes().getLastModified().asCalendar();
 
             } catch (ParseException e) {
                 throw new ServiceError(ServiceError.FAILED_DUE_TO_COMMUNICATIONS_CONSTRAINT,
diff --git a/src/main/java/org/openmuc/openiec61850/FileInformation.java b/src/main/java/org/openmuc/openiec61850/FileInformation.java
index 2d9ca64..433a273 100644
--- a/src/main/java/org/openmuc/openiec61850/FileInformation.java
+++ b/src/main/java/org/openmuc/openiec61850/FileInformation.java
@@ -21,6 +21,11 @@ public class FileInformation {
         return fileSize;
     }
 
+    /**
+     * Get the time stamp of last modification. As it is an optional attribute the return value can be null
+     * 
+     * @return the time stamp of last modification, or null if the time stamp is not present
+     */
     public Calendar getLastModified() {
         return lastModified;
     }