Date Timezone Oracle PLSQL

SQL> -- Use the TIMESTAMP type to define a column in a table
SQL>
SQL> CREATE TABLE purchases_with_timestamp (
  2    product_id INTEGER ,
  3    customer_id INTEGER ,
  4    made_on TIMESTAMP(4)
  5  );
Table created.
SQL>
SQL>
SQL> desc purchases_with_timestamp;
 Name                                                                                                  Null?    Type
 ----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------
 PRODUCT_ID                                                                                             NUMBER(38)
 CUSTOMER_ID                                                                                            NUMBER(38)
 MADE_ON                                                                                                TIMESTAMP(4)
SQL>
SQL> drop table purchases_with_timestamp;