Function and usage of mysql_to_rfc3339() in wordpress


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    The mysql_to_rfc3339() function in WordPress is used to convert dates from the MySQL datetime format to a format resembling ISO8601, which is commonly used in web and internet contexts.

    Function Signature:

    mysql_to_rfc3339( string $date_string ): string


    • Purpose: This function takes a date string in the MySQL datetime format (Y-m-d H:i:s) and converts it to a format similar to ISO8601 (Y-m-d\TH:i:s).
    • Timezone Handling: It's important to note that the function explicitly removes any timezone information. This is because MySQL datetimes are stored without timezone data, and including timezone information in the output could be misleading.
    • RFC3339 Compliance: Despite its name, the output of this function does not fully conform to the RFC3339 standard, which requires timezone information to be included.


    • $date_string (string, required): The date string to be parsed and formatted. This should be in the MySQL datetime format.

    Return Value:

    • (string): The function returns the formatted date string in an ISO8601-like format, but without timezone information.

    Sample Usage:

    Here's an example of how you might use mysql_to_rfc3339() in a WordPress context:

    // Assume you have a date in MySQL datetime format
    $mysql_date = "2024-01-09 15:30:00";
    // Convert it to an ISO8601-like format using mysql_to_rfc3339()
    $iso_date = mysql_to_rfc3339($mysql_date);
    // Output the converted date
    echo $iso_date;  // Outputs: 2024-01-09T15:30:00

    In this example, a MySQL datetime string is converted into a format that is more suitable for web applications and APIs, particularly those that use ISO8601 date formats but do not require timezone data.

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