<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def commentToJson(comment):
 """Returns a serializable Comment dict :param comment: Comment to get info for :type comment: Comment :returns: dict """

    obj = {
        'id': comment.id,
        'comment': comment.comment,
        'user': userToJson(comment.user),
        'date': comment.submit_date.isoformat(),
    }

    return obj