I'm trying to make a simple calendar view, but the problem is that i don't have idea for how to make the start date.
Can anyone show me an example of a simple calendar view?

This is my code for calendar view:

...

<!--partidos calendar-->
<record model="ir.ui.view" id="view_partidos_calendar">
    <field name="name">partidos.calendar</field>
    <field name="model">partidos</field>
    <field name="type">calendar</field>
    <field name="arch" type="xml">
        <calendar string="Partidos" date_start="date_ini">
            <field name="fecha"/>
            <field name="resultado"/>
            <field name="equipo_vis_id"/>
            <field name="equipo_loc_id"/>
            <field name="puntos_vis"/>
            <field name="puntos_loc"/>
            <field name="ganador"/>
        </calendar>
    </field>
</record>
...