DECLARE

  varMode NUMBER DEFAULT 1;
  varDate DATE;
   
  FUNCTION StrToDate(varStrDate in VARCHAR2, varFormat in VARCHAR2 DEFAULT 'DD.MM.YYYY') RETURN DATE
  IS
  BEGIN
   RETURN TO_DATE(SUBSTR(varStrDate, 1, LENGTH(varFormat)), varFormat);
  END;

BEGIN

    varDate := StrToDate('03.12.2019 00:24');

    IF TO_DATE(SYSDATE, 'DD.MM.YYYY') = varDate
    THEN 
      DBMS_OUTPUT.PUT_LINE('OK');
    END IF;

END;