How to Change Utc_offset For Timezone In Postgresql?

In PostgreSQL, the UTC offset for a timezone can be changed by altering the UTC offset value in the 'pg_timezone_names' view. This view contains information about all the timezones available in the database, including their UTC offsets. To change the UTC offset for a specific timezone, you can use the ALTER VIEW statement to update the offset value for that timezone in the 'pg_timezone_names' view.

For example, if you want to change the UTC offset for the timezone 'America/New_York' to -04:00, you can run the following query:

ALTER VIEW pg_timezone_names SET OFFSET FOR 'America/New_York' TO '-04:00';

After running this query, the UTC offset for the 'America/New_York' timezone will be updated to -04:00. Please note that changing the UTC offset for a timezone in PostgreSQL will affect the way timestamps are converted between the timezone and UTC, so make sure to double-check the changes before updating the offset value.

What is the difference between utc_offset and local time in PostgreSQL?

In PostgreSQL, utc_offset is a parameter that specifies the offset of the current time zone from Coordinated Universal Time (UTC) in seconds. This parameter does not represent a specific point in time, but rather the difference in time between the current time zone and UTC.

On the other hand, local time in PostgreSQL refers to the current time in the local time zone where the database server is located. This is the actual time displayed on the server's clock, taking into account any time zone settings configured on the server.

In summary, utc_offset represents the numerical difference in time between the current time zone and UTC, while local time represents the actual current time in the local time zone of the database server.

How to change the default utc_offset for all timestamps in PostgreSQL?

To change the default utc_offset for all timestamps in PostgreSQL, you can update the setting in the postgresql.conf file. Here's how you can do it:

1. Open the postgresql.conf file, which is typically located in the data directory of your PostgreSQL installation.
2. Find the line that starts with "timezone" in the file. If it is not there, you can add it at the end of the file.
3. Change the value of the timezone parameter to the utc_offset that you want to set as the default. For example, if you want to set the default utc_offset to UTC+2, you would change the line to: timezone = 'UTC+2'
4. Save the file and restart the PostgreSQL server for the changes to take effect.

After following these steps, all timestamps stored in the database will default to the specified utc_offset.

What is the process for reverting back to the default utc_offset in PostgreSQL?

To revert back to the default utc_offset in PostgreSQL, you can use the following steps:

1. Connect to your PostgreSQL server using a client tool like pgAdmin or psql.
2. Run the following SQL query to reset the timezone to the default utc_offset:

1

SELECT pg_reload_conf();

This will reload the PostgreSQL configuration files and apply any changes, including reverting the timezone to the default utc_offset.

1. You can also verify that the default timezone has been restored by running the following query:

1

SELECT current_setting('TIMEZONE');

This will display the current timezone setting, which should now be set to the default utc_offset.

By following these steps, you can revert back to the default utc_offset timezone setting in PostgreSQL.