How to set default values for report parameters ?

[shiv_4]

I have a report that has two parameters, Start Date and End Date. I need to set default values for Start Date to be the first day of the year and end date to be today's date. How can I set these values ? There are user expressions but how can I specify custom expression ?

[reportdev]

Here you go:

<parameter name="startDate" class="java.util.Date">
        <defaultValueExpression><![CDATA[DATE(YEAR(new Date()),01,01)]]></defaultValueExpression>
    </parameter>
    <parameter name="endDate" class="java.util.Date">
        <defaultValueExpression><![CDATA[new Date()]]></defaultValueExpression>
    </parameter>

 

startDate Expression: DATE(YEAR(new Date()),01,01)

endDate Expression: new Date()