diff --git a/rbac/engine/classes/model/map/PermissionsMapBuilder.php b/rbac/engine/classes/model/map/PermissionsMapBuilder.php
index dc79861c3..49dc48094 100644
--- a/rbac/engine/classes/model/map/PermissionsMapBuilder.php
+++ b/rbac/engine/classes/model/map/PermissionsMapBuilder.php
@@ -68,9 +68,9 @@ class PermissionsMapBuilder {
 
 		$tMap->addColumn('PER_CODE', 'PerCode', 'string', CreoleTypes::VARCHAR, true, 32);
 
-		$tMap->addColumn('PER_CREATE_DATE', 'PerCreateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('PER_CREATE_DATE', 'PerCreateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
-		$tMap->addColumn('PER_UPDATE_DATE', 'PerUpdateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('PER_UPDATE_DATE', 'PerUpdateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
 		$tMap->addColumn('PER_STATUS', 'PerStatus', 'int', CreoleTypes::INTEGER, true, null);
 
diff --git a/rbac/engine/classes/model/map/RbacUsersMapBuilder.php b/rbac/engine/classes/model/map/RbacUsersMapBuilder.php
index 29f615eaa..2623eddd7 100644
--- a/rbac/engine/classes/model/map/RbacUsersMapBuilder.php
+++ b/rbac/engine/classes/model/map/RbacUsersMapBuilder.php
@@ -78,9 +78,9 @@ class RbacUsersMapBuilder {
 
 		$tMap->addColumn('USR_DUE_DATE', 'UsrDueDate', 'int', CreoleTypes::DATE, true, null);
 
-		$tMap->addColumn('USR_CREATE_DATE', 'UsrCreateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('USR_CREATE_DATE', 'UsrCreateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
-		$tMap->addColumn('USR_UPDATE_DATE', 'UsrUpdateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('USR_UPDATE_DATE', 'UsrUpdateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
 		$tMap->addColumn('USR_STATUS', 'UsrStatus', 'int', CreoleTypes::INTEGER, true, null);
 
diff --git a/rbac/engine/classes/model/map/RolesMapBuilder.php b/rbac/engine/classes/model/map/RolesMapBuilder.php
index 8846d8899..674ecf6d3 100644
--- a/rbac/engine/classes/model/map/RolesMapBuilder.php
+++ b/rbac/engine/classes/model/map/RolesMapBuilder.php
@@ -72,9 +72,9 @@ class RolesMapBuilder {
 
 		$tMap->addColumn('ROL_CODE', 'RolCode', 'string', CreoleTypes::VARCHAR, true, 32);
 
-		$tMap->addColumn('ROL_CREATE_DATE', 'RolCreateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('ROL_CREATE_DATE', 'RolCreateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
-		$tMap->addColumn('ROL_UPDATE_DATE', 'RolUpdateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('ROL_UPDATE_DATE', 'RolUpdateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
 		$tMap->addColumn('ROL_STATUS', 'RolStatus', 'int', CreoleTypes::INTEGER, true, null);
 
diff --git a/rbac/engine/classes/model/map/SystemsMapBuilder.php b/rbac/engine/classes/model/map/SystemsMapBuilder.php
index 63e24d3a8..8589a3b7d 100644
--- a/rbac/engine/classes/model/map/SystemsMapBuilder.php
+++ b/rbac/engine/classes/model/map/SystemsMapBuilder.php
@@ -68,9 +68,9 @@ class SystemsMapBuilder {
 
 		$tMap->addColumn('SYS_CODE', 'SysCode', 'string', CreoleTypes::VARCHAR, true, 32);
 
-		$tMap->addColumn('SYS_CREATE_DATE', 'SysCreateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('SYS_CREATE_DATE', 'SysCreateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
-		$tMap->addColumn('SYS_UPDATE_DATE', 'SysUpdateDate', 'int', CreoleTypes::TIMESTAMP, true, null);
+		$tMap->addColumn('SYS_UPDATE_DATE', 'SysUpdateDate', 'int', CreoleTypes::TIMESTAMP, false, null);
 
 		$tMap->addColumn('SYS_STATUS', 'SysStatus', 'int', CreoleTypes::INTEGER, true, null);
 
diff --git a/rbac/engine/classes/model/om/BasePermissions.php b/rbac/engine/classes/model/om/BasePermissions.php
index 7f87f6032..4fa6f6751 100644
--- a/rbac/engine/classes/model/om/BasePermissions.php
+++ b/rbac/engine/classes/model/om/BasePermissions.php
@@ -46,14 +46,14 @@ abstract class BasePermissions extends BaseObject  implements Persistent {
 	 * The value for the per_create_date field.
 	 * @var        int
 	 */
-	protected $per_create_date = 943934400;
+	protected $per_create_date;
 
 
 	/**
 	 * The value for the per_update_date field.
 	 * @var        int
 	 */
-	protected $per_update_date = 943934400;
+	protected $per_update_date;
 
 
 	/**
@@ -250,7 +250,7 @@ abstract class BasePermissions extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->per_create_date !== $ts || $ts === 943934400) {
+		if ($this->per_create_date !== $ts) {
 			$this->per_create_date = $ts;
 			$this->modifiedColumns[] = PermissionsPeer::PER_CREATE_DATE;
 		}
@@ -274,7 +274,7 @@ abstract class BasePermissions extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->per_update_date !== $ts || $ts === 943934400) {
+		if ($this->per_update_date !== $ts) {
 			$this->per_update_date = $ts;
 			$this->modifiedColumns[] = PermissionsPeer::PER_UPDATE_DATE;
 		}
diff --git a/rbac/engine/classes/model/om/BaseRbacUsers.php b/rbac/engine/classes/model/om/BaseRbacUsers.php
index c8263bc17..64dd0f2e8 100644
--- a/rbac/engine/classes/model/om/BaseRbacUsers.php
+++ b/rbac/engine/classes/model/om/BaseRbacUsers.php
@@ -74,21 +74,21 @@ abstract class BaseRbacUsers extends BaseObject  implements Persistent {
 	 * The value for the usr_due_date field.
 	 * @var        int
 	 */
-	protected $usr_due_date = 943934400;
+	protected $usr_due_date;
 
 
 	/**
 	 * The value for the usr_create_date field.
 	 * @var        int
 	 */
-	protected $usr_create_date = 943934400;
+	protected $usr_create_date;
 
 
 	/**
 	 * The value for the usr_update_date field.
 	 * @var        int
 	 */
-	protected $usr_update_date = 943934400;
+	protected $usr_update_date;
 
 
 	/**
@@ -502,7 +502,7 @@ abstract class BaseRbacUsers extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->usr_due_date !== $ts || $ts === 943934400) {
+		if ($this->usr_due_date !== $ts) {
 			$this->usr_due_date = $ts;
 			$this->modifiedColumns[] = RbacUsersPeer::USR_DUE_DATE;
 		}
@@ -526,7 +526,7 @@ abstract class BaseRbacUsers extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->usr_create_date !== $ts || $ts === 943934400) {
+		if ($this->usr_create_date !== $ts) {
 			$this->usr_create_date = $ts;
 			$this->modifiedColumns[] = RbacUsersPeer::USR_CREATE_DATE;
 		}
@@ -550,7 +550,7 @@ abstract class BaseRbacUsers extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->usr_update_date !== $ts || $ts === 943934400) {
+		if ($this->usr_update_date !== $ts) {
 			$this->usr_update_date = $ts;
 			$this->modifiedColumns[] = RbacUsersPeer::USR_UPDATE_DATE;
 		}
diff --git a/rbac/engine/classes/model/om/BaseRoles.php b/rbac/engine/classes/model/om/BaseRoles.php
index bd760c110..a5c273665 100644
--- a/rbac/engine/classes/model/om/BaseRoles.php
+++ b/rbac/engine/classes/model/om/BaseRoles.php
@@ -60,14 +60,14 @@ abstract class BaseRoles extends BaseObject  implements Persistent {
 	 * The value for the rol_create_date field.
 	 * @var        int
 	 */
-	protected $rol_create_date = 943934400;
+	protected $rol_create_date;
 
 
 	/**
 	 * The value for the rol_update_date field.
 	 * @var        int
 	 */
-	protected $rol_update_date = 943934400;
+	protected $rol_update_date;
 
 
 	/**
@@ -312,7 +312,7 @@ abstract class BaseRoles extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->rol_create_date !== $ts || $ts === 943934400) {
+		if ($this->rol_create_date !== $ts) {
 			$this->rol_create_date = $ts;
 			$this->modifiedColumns[] = RolesPeer::ROL_CREATE_DATE;
 		}
@@ -336,7 +336,7 @@ abstract class BaseRoles extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->rol_update_date !== $ts || $ts === 943934400) {
+		if ($this->rol_update_date !== $ts) {
 			$this->rol_update_date = $ts;
 			$this->modifiedColumns[] = RolesPeer::ROL_UPDATE_DATE;
 		}
diff --git a/rbac/engine/classes/model/om/BaseSystems.php b/rbac/engine/classes/model/om/BaseSystems.php
index ef6c5e567..8ebfd717b 100644
--- a/rbac/engine/classes/model/om/BaseSystems.php
+++ b/rbac/engine/classes/model/om/BaseSystems.php
@@ -46,14 +46,14 @@ abstract class BaseSystems extends BaseObject  implements Persistent {
 	 * The value for the sys_create_date field.
 	 * @var        int
 	 */
-	protected $sys_create_date = 943934400;
+	protected $sys_create_date;
 
 
 	/**
 	 * The value for the sys_update_date field.
 	 * @var        int
 	 */
-	protected $sys_update_date = 943934400;
+	protected $sys_update_date;
 
 
 	/**
@@ -232,7 +232,7 @@ abstract class BaseSystems extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->sys_create_date !== $ts || $ts === 943934400) {
+		if ($this->sys_create_date !== $ts) {
 			$this->sys_create_date = $ts;
 			$this->modifiedColumns[] = SystemsPeer::SYS_CREATE_DATE;
 		}
@@ -256,7 +256,7 @@ abstract class BaseSystems extends BaseObject  implements Persistent {
 		} else {
 			$ts = $v;
 		}
-		if ($this->sys_update_date !== $ts || $ts === 943934400) {
+		if ($this->sys_update_date !== $ts) {
 			$this->sys_update_date = $ts;
 			$this->modifiedColumns[] = SystemsPeer::SYS_UPDATE_DATE;
 		}
diff --git a/rbac/engine/config/schema.xml b/rbac/engine/config/schema.xml
index 3f3c3c7ce..2fc6b8b87 100644
--- a/rbac/engine/config/schema.xml
+++ b/rbac/engine/config/schema.xml
@@ -23,8 +23,8 @@
     </vendor>
     <column name="PER_UID" type="VARCHAR" size="32" required="true" primaryKey="true" default="" />
     <column name="PER_CODE" type="VARCHAR" size="32" required="true" default="" />
-    <column name="PER_CREATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
-    <column name="PER_UPDATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
+    <column name="PER_CREATE_DATE" type="TIMESTAMP" />
+    <column name="PER_UPDATE_DATE" type="TIMESTAMP" />
     <column name="PER_STATUS" type="INTEGER" required="true" default="1" />
     <column name="PER_SYSTEM" type="VARCHAR" size="32" required="true" default="00000000000000000000000000000002" />
   </table>
@@ -53,8 +53,8 @@
     <column name="ROL_PARENT" type="VARCHAR" size="32" required="true" default="" />
     <column name="ROL_SYSTEM" type="VARCHAR" size="32" required="true" default="" />
     <column name="ROL_CODE" type="VARCHAR" size="32" required="true" default="" />
-    <column name="ROL_CREATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
-    <column name="ROL_UPDATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
+    <column name="ROL_CREATE_DATE" type="TIMESTAMP" />
+    <column name="ROL_UPDATE_DATE" type="TIMESTAMP" />
     <column name="ROL_STATUS" type="INTEGER" required="true" default="1" />
   </table>
   <table name="ROLES_PERMISSIONS">
@@ -104,8 +104,8 @@
     </vendor>
     <column name="SYS_UID" type="VARCHAR" size="32" required="true" primaryKey="true" default="" />
     <column name="SYS_CODE" type="VARCHAR" size="32" required="true" default="" />
-    <column name="SYS_CREATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
-    <column name="SYS_UPDATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
+    <column name="SYS_CREATE_DATE" type="TIMESTAMP" />
+    <column name="SYS_UPDATE_DATE" type="TIMESTAMP" />
     <column name="SYS_STATUS" type="INTEGER" required="true" default="0" />
   </table>
   <table name="RBAC_USERS">
@@ -135,9 +135,9 @@
     <column name="USR_FIRSTNAME" type="VARCHAR" size="50" required="true" default="" />
     <column name="USR_LASTNAME" type="VARCHAR" size="50" required="true" default="" />
     <column name="USR_EMAIL" type="VARCHAR" size="100" required="true" default="" />
-    <column name="USR_DUE_DATE" type="DATE" required="true" default="0000-00-00" />
-    <column name="USR_CREATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
-    <column name="USR_UPDATE_DATE" type="TIMESTAMP" required="true" default="0000-00-00 00:00:00" />
+    <column name="USR_DUE_DATE" type="DATE" required="true" />
+    <column name="USR_CREATE_DATE" type="TIMESTAMP" />
+    <column name="USR_UPDATE_DATE" type="TIMESTAMP" />
     <column name="USR_STATUS" type="INTEGER" required="true" default="1" />
     <column name="USR_AUTH_TYPE" type="VARCHAR" size="32" required="true" default="" />
     <column name="UID_AUTH_SOURCE" type="VARCHAR" size="32" required="true" default="" />
diff --git a/rbac/engine/data/mysql/schema.sql b/rbac/engine/data/mysql/schema.sql
index cd005fae3..70bb48b12 100644
--- a/rbac/engine/data/mysql/schema.sql
+++ b/rbac/engine/data/mysql/schema.sql
@@ -14,8 +14,8 @@ CREATE TABLE `PERMISSIONS`
 (
 	`PER_UID` VARCHAR(32) default '' NOT NULL,
 	`PER_CODE` VARCHAR(32) default '' NOT NULL,
-	`PER_CREATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
-	`PER_UPDATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
+	`PER_CREATE_DATE` DATETIME,
+	`PER_UPDATE_DATE` DATETIME,
 	`PER_STATUS` INTEGER default 1 NOT NULL,
 	`PER_SYSTEM` VARCHAR(32) default '00000000000000000000000000000002' NOT NULL,
 	PRIMARY KEY (`PER_UID`)
@@ -33,8 +33,8 @@ CREATE TABLE `ROLES`
 	`ROL_PARENT` VARCHAR(32) default '' NOT NULL,
 	`ROL_SYSTEM` VARCHAR(32) default '' NOT NULL,
 	`ROL_CODE` VARCHAR(32) default '' NOT NULL,
-	`ROL_CREATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
-	`ROL_UPDATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
+	`ROL_CREATE_DATE` DATETIME,
+	`ROL_UPDATE_DATE` DATETIME,
 	`ROL_STATUS` INTEGER default 1 NOT NULL,
 	PRIMARY KEY (`ROL_UID`)
 )ENGINE=MyISAM  DEFAULT CHARSET='utf8' COMMENT='Roles';
@@ -62,8 +62,8 @@ CREATE TABLE `SYSTEMS`
 (
 	`SYS_UID` VARCHAR(32) default '' NOT NULL,
 	`SYS_CODE` VARCHAR(32) default '' NOT NULL,
-	`SYS_CREATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
-	`SYS_UPDATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
+	`SYS_CREATE_DATE` DATETIME,
+	`SYS_UPDATE_DATE` DATETIME,
 	`SYS_STATUS` INTEGER default 0 NOT NULL,
 	PRIMARY KEY (`SYS_UID`)
 )ENGINE=MyISAM  DEFAULT CHARSET='utf8' COMMENT='Systems';
@@ -82,9 +82,9 @@ CREATE TABLE `USERS`
 	`USR_FIRSTNAME` VARCHAR(50) default '' NOT NULL,
 	`USR_LASTNAME` VARCHAR(50) default '' NOT NULL,
 	`USR_EMAIL` VARCHAR(100) default '' NOT NULL,
-	`USR_DUE_DATE` DATE default '0000-00-00' NOT NULL,
-	`USR_CREATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
-	`USR_UPDATE_DATE` DATETIME default '0000-00-00 00:00:00' NOT NULL,
+	`USR_DUE_DATE` DATE  NOT NULL,
+	`USR_CREATE_DATE` DATETIME,
+	`USR_UPDATE_DATE` DATETIME,
 	`USR_STATUS` INTEGER default 1 NOT NULL,
 	`USR_AUTH_TYPE` VARCHAR(32) default '' NOT NULL,
 	`UID_AUTH_SOURCE` VARCHAR(32) default '' NOT NULL,