`Please send a post containing the following

        {
        "start": <start utc>,
        "end": <end utc>,
        "weekday": <weekday 0-6>,
        "successcode": <successcode>,
        "successtext": <successtext>,
        "errorcode": <errorcode (eg 500)>,
        "errortext": <errortext (eg "Error")>,
        }`