I have a filter to filter my task that are due today

[['date_deadline','<=',time.strftime('%Y-%m-%d')], ['user_id', '=', 1], '|', '|', ['state', '=', 'draft'], ['state', '=', 'open'], ['state', '=', 'pending']]

when I add this view to my dashboard (ir.ui.view.custom,114) it replaces the relative date with a fix date

<form string="My Dashboard" version="7.0">
        <board style="2-1">
            <column>

            <action context="{'lang': 'de_DE', 'group_by': ['context_id'], 'tz': 'Europe/Berlin', 'uid': 1, 'dashboard_merge_domains_contexts': False}" domain="[['date_deadline', '&lt;=', '2013-09-06'], ['user_id', '=', 1], '|', '|', ['state', '=', 'draft'], ['state', '=', 'open'], ['state', '=', 'pending']]" name="192" string="Aufgaben" view_mode="kanban" /></column><column>

            </column><column>

            </column>
        </board>
    </form>

I am struggling changing this fix date in a relative date again in the setting. Just copy and paste the code from the filter does not work.