crm_tree_date_search/voucher.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data noupdate="1">

        <record id="crm.crm_case_category_act_leads_all" model="ir.actions.act_window">
            <field name="res_model">crm.lead</field>
            <!-- <field name="domain">[('type','=','lead')]</field> -->
            <field name="context">{'dates_filter' : ['create_date']}</field>
        </record>

    </data>
</openerp>