Given the limited utility then, the U.S. and its Allies must now decide if all the trouble involved in setting up a zone — including inevitable questions of legality — are worth the risk.

Given the limited utility then, the U. S. and its Allies must now decide if all the trouble involved in setting up a zone — including inevitable questions of legality — are worth the risk.

If you expect callers from outside your time zone, you're just asking for trouble by trying to provide a time-related feature.