Adam Tauno Williams <awilliam(at)whitemice(dot)org> writes:
> OGo=> create index job_date_only on job(extract(date from start_date at
> time zone 'utc'));
> ERROR: timestamp units "date" not recognized
There's no field called "date" in a timestamp. I think what you're
trying to achieve is "date_trunc('day', start_date at time zone 'utc')"
http://www.postgresql.org/docs/9.2/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
regards, tom lane