I traced a bug in our application down to this basic operation: set timezone to 'US/Eastern'; select '11/02/2008'::timestamptz, '12:10'::time, '11/02/2008'::timestamptz + '12:10'::time; I have a date and a time stored separately and I want to combine them, and use them in some timezone-aware calculations. When I add the time 12:10 to the date 11/2/08, I expect the timestamp "11/2/08 12:10" but instead, I get "11/2/08 11:10". It's probably not coincidence that daylight saving time rolls back one hour on the morning of 11/2. Still, I would have expected the above behavior when adding an interval to a timestamp, but not a time. Is the time being cast to an interval before the add? Is there a better way to combine a date with a time and get a timestamptz ? (the values are stored in the database, and are not literals as in my example)
