How to convert the Date into Epoch in iReport and Jasperserver

I want to create a report for login history between two dates.

The login history table has the following fields:

login_date  (data type is integer)
user_id     (data type is integer)

Sample records

|login_date |user_id|
+-----------+-------+
|1299954600 |   105 |
|1299954600 |   105 |
|1299954600 |   105 |
|1299954600 |   105 |
|1301164200 |   114 |
|1301164200 |   106 |
|1301769000 |   110 |
|1301164200 |   106 |
|1301769000 |   106 |
|1301769000 |   106 |
|1301769000 |   106 |
|1302978600 |   102 |
|1302373800 |   112 |
|1302978600 |   111 |
|1302978600 |   111 |
|1302978601 |   111 |

Note: I have stored the login date in Epoch time.

I want to create the report for following query.

SELECT
  user_id,
  count(user_id)
FROM
  rep_time_tracking
WHERE
  login_date between 1301596200 AND 1303496940
GROUP BY 1;

I have开发者_如何转开发 added two parameters for run time parameter.

Example. ${FROM} and $P{TO}, value expression is Date/Time.

Now the user selects the date and time using the input I want to convert into Epoch.

How to achieve this in iReport and JasperServer?

Its pretty Simple, All You have to do is call a function on Date which is getTime() it gives you UTC time and then use it as Parameter in query.!

See the Screent Shot.