Fix operation logs not loading with mssql

## Purpose
* Fixes https://roadmap.entgra.net/issues/10050

## Description
* Converting BIGINT to timestamp directly is not supported with MSSQL. Timestamp class is used for conversion.

Co-authored-by: prathabanKavin <kavinprathaban025@gmail.com>
Reviewed-on: #117
Co-authored-by: Kavin Prathaban <kavin@entgra.io>
Co-committed-by: Kavin Prathaban <kavin@entgra.io>

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/operation/mgt/dao/impl/operation/SQLServerOperationDAOImpl.java

@@ -56,13 +56,15 @@ import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.sql.Timestamp;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.ArrayList;
-import java.util.LinkedList;
+
 /**
  * This class holds the implementation of OperationDAO which can be used to support SQLServer db syntax.
  */
@@ -192,7 +194,7 @@ public class SQLServerOperationDAOImpl extends GenericOperationDAOImpl {
                         operation = new Operation();
                         operation.setId(rs.getInt("ID"));
                         operation.setType(Operation.Type.valueOf(rs.getString("TYPE")));
-                        operation.setCreatedTimeStamp(rs.getTimestamp("CREATED_TIMESTAMP").toString());
+                        operation.setCreatedTimeStamp(new Timestamp(rs.getLong("CREATED_TIMESTAMP") * 1000L).toString());
                         if (rs.getLong("UPDATED_TIMESTAMP") == 0) {
                             operation.setReceivedTimeStamp("");
                         } else {