SQL & PL/SQL

I am trying to insert timestamp values in the database,

e.g. 2012-02-21T10:15:01.000-06:00

insert into table1 (event_time)
values (TIMESTAMP '2012-02-21T10:15:01.000-06:00')

Error: ORA-01861: literal does not match format string

after replacing 'T' with ' ' in the timestamp value,

insert into table1 (event_time)
values (TIMESTAMP '2012-02-21 10:15:01.000-06:00')

it works fine.


What should I do to insert timestamp values with 'T'?

Thanks.