SQL & PL/SQL

Hi all,
I need to do range partitioning on a table using current system timestamp. sth like

CREATE TABLE SAMPLE(ID NUMBER, SAMPLE_DATE TIMESTAMP)PARTITION BY RANGE(SAMPLE_DATE)(PARTITION P1 VALUES LESS THAN (LOCALTIMESTAMP));

Is there any way I can assign a dynamic date using variable other than string literal after VALUES LESS THAN clause? I tried achieving this with stored procedure but always throws error for this filed.

CREATE OR REPLACE PROCEDURE partition_test
IS
x TIMESTAMP;
comm long;
BEGIN
SELECT LOCALTIMESTAMP into x from dual;
comm := 'CREATE TABLE SAMPLE(ID NUMBER, SAMPLE_DATE TIMESTAMP)PARTITION BY RANGE(SAMPLE_DATE)(PARTITION P1 VALUES LESS THAN (x))';
execute immediate comm;
END partition_test;
/

error I'm getting is
ORA-14019: partition bound element must be one of: string, datetime or interval literal, number, or MAXVALUE
Any clue? Would really appreciate your help.

Noman