pgsql: Fix date_trunct for December dates that are in the next year, - Mailing list pgsql-committers

Log Message:
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Fix date_trunct for December dates that are in the next year, e.g.:

        SELECT date_trunc('week', '2002-12-31'::date);

Backpatch to 8.0.X.

Per report from Nick Johnson.

Modified Files:
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    pgsql/src/backend/utils/adt:
        timestamp.c (r1.128 -> r1.129)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/timestamp.c.diff?r1=1.128&r2=1.129)