The <sql:dateParam> tag is a JSTL SQL tag used to specify a date parameter for an SQL query. The tag takes two attributes: value and type.

The value attribute specifies the value of the date parameter, and the type attribute specifies the SQL type of the parameter.

The syntax of the <sql:dateParam> tag is as follows:

<sql:dateParam value="dateValue" type="sqlType" />

where dateValue is the value of the date parameter, and sqlType is the SQL type of the parameter.

For example, the following JSP code retrieves all orders placed on or after January 1, 2022, using a date parameter:

<sql:setDataSource
  var="myDataSource"
  driver="com.mysql.jdbc.Driver"
  url="jdbc:mysql://localhost/mydatabase"
  user="myuser"
  password="mypassword" />

<sql:query dataSource="${myDataSource}">
  SELECT *
  FROM orders
  WHERE order_date >= ?
  ORDER BY order_date
  <sql:dateParam value="2022-01-01" type="DATE" />
</sql:query>

In this example, the value attribute is set to "2022-01-01", which is the date parameter value, and the type attribute is set to "DATE", which is the SQL type of the parameter.

Note that the sql tag library must be imported at the beginning of the JSP page using the following tag:

<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>