In my module i try to regroup the date field by day, but when trying to upgrade the module an Invalid XML for view error appear:

This is the part of XML that generate the error (:year):

<record model="ir.ui.view" id="id_view_contact">

    <field name="name">test.base.graph.view1</field>

    <field name="model">test.base</field>

    <field name="type">graph</field>

    <field name="arch" type="xml">

            <graph string="contacts" type="bar" >

                    <field name="create_date:year" type="row" group="False" />

                    <field name="name" type="col"/>

            </graph>

        </field>

</record>

this is the OpenERP V7 documentation that shows the datetime attribute : https://doc.odoo.com/trunk/web_graph/