1. com.unboundid.ldap.sdk.controls.ContentSyncRequestControl
 2. com.unboundid.ldap.sdk.controls.PersistentSearchRequestControl
 3. com.unboundid.ldap.sdk.experimental.ActiveDirectoryDirSyncControl
 4. com.unboundid.ldap.sdk.ChangeLogEntry

If all else fails, you may be able to use range searches targeting the createTimestamp and/or modifyTimestamp attributes to identify entries created and/or updated after a specified time.