Interest shall be awarded on the damages involved for the period beginning on the earliest date for which injury can be established and ending on the date of judgment, unless the court finds that the award of all or part of such interest is unjust in the circumstances.
This section shall be applicable only if the challenged conduct of a person defending against a claim is not in violation of any decree or order, entered or issued after October 11, 1984, in any case or proceeding under the antitrust laws or any State law similar to the antitrust laws challenging such conduct as part of a joint venture, or of a standards development activity engaged in by a standards development organization.