please try to use this filter command in your search view

<filter string="This Week" name="date_planned_start" domain="[                ('date_planned_start', '>=', (datetime.datetime.combine(context_today() + relativedelta(weeks=-1,days=1,weekday=0), datetime.time(0,0,0)).to_utc()).strftime('%Y-%m-%d %H:%M:%S')),                ('date_planned_start', '<', (datetime.datetime.combine(context_today() + relativedelta(days=1,weekday=0), datetime.time(0,0,0)).to_utc()).strftime('%Y-%m-%d %H:%M:%S'))]"/>