respartnercumple_filter/view/partner_view.xml

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

        <record id="view_res_partnerfilter_search2" model="ir.ui.view">
            <field name="name">res.partner.filter.search2</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_res_partner_filter" />
            <field name="arch" type="xml">
              <search>
                  <separator/>

                       <filter string="Mes actual" domain="[('fecha_nac','&lt;',(context_today()+relativedelta(months=1)).strftime('%%Y-%%m-01')), ('fecha_nac','&gt;=',time.strftime('%%Y-%%m-01'))]"/>
                       <filter string="Esta semana" domain="[('fecha_nac', '&gt;=', ((context_today()+relativedelta(weeks=-1, days=1, weekday=0)).strftime('%%Y-%%m-%%d'))),('fecha_nac', '&lt;=', ((context_today()+relativedelta(weeks=0, weekday=6)).strftime('%%Y-%%m-%%d')))]"/>
                       <filter string="Hoy" domain="[('fecha_nac', '&gt;=', datetime.datetime.now().strftime('%Y-%m-%d 00:00:00')),('fecha_nac', '&lt;=',datetime.datetime.now().strftime('%Y-%m-%d 23:23:59'))]"/>
                       <filter string="Ayer" domain="[('fecha_nac','&lt;=', (datetime.date.today()-relativedelta(days=1)).strftime('%%Y-%%m-%%d')),('fecha_nac','&gt;=',(datetime.date.today()-relativedelta(days=1)).strftime('%%Y-%%m-%%d'))]"/>
                  <separator/>
                  <group string="Agrupar por">
                      <filter string="Por dia" context="{'group_by':'fecha_nac:day'}"/>
                  </group>
               </search>
            </field>
        </record>

    </data>
</openerp>