Compare date on plsql

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Oracle

trigger

I have to create trigger that raise an error if I try to delete from table and the date on the table equal with sysdate.

I tried to delete a row that contain today date 25-nov-18 and the trigger doesnt work , I tried to print the values of :old.datedep and dateres and there are the same. 25-nov-2018 25-nov-2018 Can someone help me? thank you
this is my code:

What I have tried:

create or replace trigger nonViolation
before insert or delete on reservation
for each row
declare 
error exception;
error2 exception;
dateres date:=sysdate;
begin
if inserting then
if :new.dateDep<dateres then raise error;
end if;
end if;
if deleting then
if (:OLD.datedep=dateres)
then 
raise error2;
end if;
end if;
exception
when error2 then
raise_application_error(-20003,'supression impossible');
when error then 
raise_application_error(-20001,'reservation impossible');
end;