i want to display only the year from request_date_from in a q-web report 

i tried this code 

 <span t-esc="datetime.datetime.strptime(o.request_date_from, '%Y-%m-%d').strftime('%Y')"/>

but i get this error 

Error to render compiling AST TypeError: strptime() argument 1 must be str, not datetime.date Template: mymodule.leave 
Path: /t/t/t/t/div/p/span 
Node: <span t-esc="datetime.datetime.strptime(o.request_date_from, '%Y-%m-%d').strftime('%Y')"/>)