How to Insert TIMESTAMP Column into Redshift

I created a table in Redshift:

create table myTable (
       dateTime TIMESTAMP NOT NULL,
       ...
);

However, when I try to insert a record that contains a dateTime of, I get an error from stl_load_errors.

20080215 04:05:06.789

Since I took this timestamp from the docs, I would've expected it to have worked.

The error logs from Redshift show:

Invalid timestamp format or value [YYYY-MM-DD HH24:MI:SS]

However, I'd like to include 3 extra seconds, example: 2015-02-01 15:49:35.123.

How do I need to modify my timestamp field to insert it with the extra precision on seconds?