Hi,

It seems like there is a potential issue with the formatting of the domain in your search view. Additionally, you may need to handle the context in a way that dynamically updates the date values based on the selected filter.

Here's an example of how you can modify your search view to handle late and today activities:

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

<field name="name">crm.activity.search</field>

<field name="model">crm.activity</field>

    <field name="arch" type="xml">

        <search>

<filter string="Late Activities" name="late" domain="[('my_activity_date_deadline', '&lt;', context_today().strftime('%Y-%m-%d'))]" />

<filter string="Today's Activities" name="today" domain="[('my_activity_date_deadline', '=', context_today().strftime('%Y-%m-%d'))]" />

<filter string="Future Activities" name="future" domain="[('my_activity_date_deadline','&gt;', context_today().strftime('%Y-%m-%d'))]" />

        </search>

    </field>

</record>

Please make sure to replace 'crm.activity' with the actual model name

Hope it helps