jws wrote: > Is there a way to round an interval to the nearest minute...
Yes. See date_trunc function. Of course this truncates down to the specified unit. If you want to round up/down to the nearest minute I suppose you could just add '30 seconds'::interval before truncating. select now(), date_trunc('minute', now()), date_trunc('minute', now()+'30 seconds'::interval); -[ RECORD 1 ]----------------------------- now | 2007-05-22 10:25:37.706279-07 date_trunc | 2007-05-22 10:25:00-07 date_trunc | 2007-05-22 10:26:00-07 Cheers, Steve ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match