I've created a filter for filter last month and last year of order it doesn't work correctly

<filter icon="terp-go-month" string="Last Year"
                         domain="[('date_order','&lt;=', (context_today()-relativedelta(day=31,months=12,years=1)).strftime('%%Y-%%m-%%d')),
                         ('date_order','&gt;=',(context_today()-relativedelta(day=1,months=1,years=1)).strftime('%%Y-%%m-%%d'))]"
                         help="last year"/>

<filter icon="terp-go-month" string="Last Month"
                         domain="[('date_order','&lt;=', (context_today()-relativedelta(day=31, months=1)).strftime('%%Y-%%m-%%d')),
                         ('date_order','&gt;=',(context_today()-relativedelta(day=1,months=1)).strftime('%%Y-%%m-%%d'))]"
                         help="last month"/>

and I create filter for month like this it works correctly

<filter icon="terp-go-month" string="Month"
                             name="month"
                             domain="[('date_order','&lt;=',
                             (context_today()+relativedelta(day=31)).strftime('%%Y-%%m-%%d')),
                             ('date_order','&gt;=',
                             (context_today()-relativedelta(day=1)).strftime('%%Y-%%m-%%d'))]"
                             help="current month"/>

I dont know why? Thank for support