Frank van Vugt <ftm(dot)van(dot)vugt(at)foxi(dot)nl> writes:
> One might consider adding a single line to the end of 9.9 of the docs that
> warns for this behaviour and/or add the specific example....?
I put some more explanation and examples into the 9.0 docs:
http://developer.postgresql.org/pgdocs/postgres/functions-datetime.html
regards, tom lane