Discarding Millisecond and Second Parts from Timestamps
When working with timestamps, there are often scenarios where you may need to remove the millisecond and/or second components. Here are two methods to achieve this:
1. Casting to Timestamp(0)
Casting a timestamp to timestamp(0) or timestamptz(0) rounds the value to full seconds, effectively discarding the millisecond and second parts:
SELECT now()::timestamp(0);
2. Using the date_trunc() Function
The date_trunc() function allows you to truncate a timestamp to a specified interval. By specifying 'second' as the first argument, you can truncate the timestamp to the full second:
SELECT date_trunc('second', now()::timestamp);
You can also use 'minute' as the first argument to truncate the timestamp to the next full minute, discarding both seconds and milliseconds.
Note:
- Both methods will return a timestamp of the same type as the input (timestamp, timestamptz, or interval).
- The fraction of a second is not stored in table columns of type timestamp(0) or timestamptz(0).
- The date_trunc() function supports various intervals, allowing you to truncate to any desired precision.
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