Home/ Questions/Q 6533771
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-25T10:10:08+00:00

Postgres can round (truncate) timestamps using the date_trunc function, like this: date_trunc(‘hour’, val) date_trunc(‘minute’,

  • 0

Postgres can round (truncate) timestamps using the date_trunc function, like this:

date_trunc('hour', val)
date_trunc('minute', val)

I’m looking for a way to truncate a timestamp to the nearest 5-minute boundary so, for example, 14:26:57 becomes 14:25:00. The straightforward way to do it is like this:

date_trunc('hour', val) + date_part('minute', val)::int / 5 * interval '5 min'

Since this is a performance-critical part of the query, I’m wondering whether this is the fastest solution, or whether there’s some shortcut (compatible with Postgres 8.1+) that I’ve overlooked.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I don’t think there is any quicker method.

    And I don’t think you should be worried about the performance of the expression.

    Everything else that is involved in executing your (SELECT, UPDATE, …) statement is most probably a lot more expensive (e.g. the I/O to retrieve rows) than that date/time calculation.

    • 0