The following bug has been logged online:

Bug reference:      4789
Logged by:          Robert Kruuus
Email address:      robert.kr...@gov.sk.ca
PostgreSQL version: 8.3.7
Operating system:   [FREEBSD] amd64-portbld-freebsd7.1, compiled by GCC cc
(GCC) 4.2.1
Description:        ERROR 22008 on timestamp import
Details: 

Copying from a csv file (using both COPY as superuser and the psql \copy
command) fails with DATETIME FIELD OVERFLOW for values with x.9999999Z
(seven or more nines after the decimal)
'1999-08-06 05:34:10.999999643Z' and '1999-08-06 00:12:57.999999900Z' will
both fail where for example
'1999-01-12 21:08:33.991259510Z' work correctly. I am not concerned about
the rounding inherent in the datatype.

More generally, even 
SELECT '1999-08-06 00:12:57.9999999Z'::timestamp with time zone; will throw
the same error, so it seems to be something in the way Postgres
rounds/truncates the field.

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