[luhn]

I love Postgres' time handling, even more so whenever I have to handcraft time-based queries in other databases, like MongoDB (which is more often than I'd like).

Some things the author didn't mention that I like:

* Timestamp with time zone string parsing: '2013-06-27 13:15:00 US/Pacific'::timestamptz

* Timezone-aware to timezone-naive conversion (or vice versa): mytztime AT TIME ZONE 'US/Pacific'

* I haven't used tstzrange yet, but it looks pretty powerful.