timestamp 'default' question

All,

I have a TABLE entry for time:

timeaccessioned | timestamp without time zone | not null default
('now'::text)::timestamp(6) with time zone

w/ default set to 'now', I thought postgres would fill in time - not so?

When I attempt to load feature table w/out time entered ->

psql:feature.stdin:1: ERROR: copy: line 1, Missing data for column
"timeaccessioned"

COPY feature (feature_id, dbxref_id, organism_id, name, uniquename,
residues, seqlen, md5checksum, type_id, timeaccessioned,
timelastmodified) FROM stdin;
1 \N 133 scaffold_1 chlre01.1 AAATCCAAGC
376197 53adae6396a767c7e88910c73b9d0b6b 3
\.

Can I get postgres to load current time, or do I need to generate it in
the script creating the SQL?

Charles