mysql error while trying to insert a timestamp

Question

I’m trying to pass a timestamp per parameter for a Function, but I end up getting an error

ERROR:  invalid input syntax for type time: "10"

the stretch where I pass is:

select agendar('2010-01-01 10:00:01')

the stretch you receive is:

CREATE OR REPLACE FUNCTION agendar(dia timestamp) returns bool as $$
declare

-- aqui eu declaro as variaveis....
begin
-- aqui o meu codigo
end
$$ language plpgsql