MySQL: implementing Date Formatting and Timezone Adjustment in Queries
I'm collaborating on a project where I've looked through the documentation and I'm still confused about I'm running into a question with date formatting in my MySQL queries... I have a table `events` that stores timestamps in UTC, and I want to retrieve these timestamps converted to 'America/New_York' timezone for my application. However, I'm getting inconsistent results. Here’s a simplified version of my query: ```sql SELECT event_id, DATE_FORMAT(CONVERT_TZ(event_time, '+00:00', 'America/New_York'), '%Y-%m-%d %H:%i:%s') AS formatted_time FROM events; ``` The `event_time` column is defined as `DATETIME` and contains values like `2023-10-10 14:00:00`. The expected output should show the correct local time, but instead, I’m seeing some times returned as `NULL` or in unexpected formats. I verified that the timezone tables are populated with `SELECT COUNT(*) FROM mysql.time_zone_name;` which returns a positive count, indicating that the timezone data is indeed loaded. Additionally, I encountered the following behavior message at times: `behavior 1292 (22007): Incorrect datetime value: 'NULL'`. I've tried casting the `event_time` to `TIMESTAMP` before the timezone conversion, but it didn’t resolve the scenario: ```sql SELECT event_id, DATE_FORMAT(CONVERT_TZ(CAST(event_time AS TIMESTAMP), '+00:00', 'America/New_York'), '%Y-%m-%d %H:%i:%s') AS formatted_time FROM events; ``` This query still results in some rows having `NULL` for `formatted_time`. Can anyone guide to understand why this is happening and how to ensure I get the correctly formatted time without any `NULL` values? Any ideas what could be causing this? Is there a better approach?