def METHOD_NAME(host_guest_time_before,
              host_guest_time_after):
    """
    Function compares diff of host and guest time before and after.
    It allows compare time in different timezones.
    :params host_guest_time_before: Time from host and guest.
    :type host_guest_time_before: (float, float)
    :params host_guest_time_after: Time from host and guest.
    :type host_guest_time_after: (float, float)
    :returns: Time diff between server and guest time.
    :rtype: float
    """
    before_diff = host_guest_time_before[0] - host_guest_time_before[1]
    after_diff = host_guest_time_after[0] - host_guest_time_after[1]
    return before_diff - after_diff