def FormatIso8601(t):
    """
       Convert a time expressed in seconds to ISO 8601 time format string

       :type t: ``int``
       :param t: Time expressed in seconds (required)

       :return: An ISO 8601 time format string
       :rtype: ``str``
    """
    return t.strftime("%Y-%m-%dT%H:%M:%S")