convert_tz returns null

sachin
edited October 28 in database

Running below query returns null

SELECT CONVERT_TZ('2024-10-28 12:00:00', 'UTC', 'America/New_York');
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Answers

  • When CONVERT_TZ in MySQL returns NULL, it typically indicates that one of the timezone parameters is invalid or that the timezone tables are not populated correctly. Here are a few steps to troubleshoot this issue:

    Step 1: Check Timezone Tables: Ensure that your timezone tables are populated.

    SELECT COUNT(*) FROM mysql.time_zone_name;
    

    If this returns 0, you need to load the timezone data. You can populate them using the mysql_tzinfo_to_sql utility or load the time zone data from your OS.

    Step 2: Locate the Time Zone Files

    The time zone data is usually located in /usr/share/zoneinfo. This directory contains the necessary files for various time zones.

    Step 3: Load the Time Zone Data into MySQL

    Login into you shell and use the following command to load the time zone data:

    mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql
    

    You will be prompted for your MySQL root password. This command reads the time zone information from the specified directory and imports it into the MySQL mysql database.

    Step 4: Verify Time Zone Data

    After loading, you can verify that the time zone data is present:

    SELECT COUNT(*) FROM mysql.time_zone_name;
    

    If the count is greater than zero, the data has been loaded successfully.

    Step 5: Use CONVERT_TZ

    Now you can use the CONVERT_TZ function. Here’s an example query:

    SELECT CONVERT_TZ('2024-10-28 12:00:00', 'UTC', 'America/New_York');
    

    Make sure to replace the timezone strings with the appropriate values you need.

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