Company settings establish defaults that affect the whole org. A locale controls display conventions; a time zone controls the interpretation of local times. Business hours describe when a support calendar is open, and a fiscal year supplies reporting periods. These settings solve different problems.
Before changing a default, identify the users and processes that depend on it. A support team in another region may need a separate business-hours definition rather than a change to everyone's time zone. Currency management also has consequences for historical reporting. This simulator uses one stated currency and checked decisions for hosted org settings. Read the requirement closely: a formatting request rarely justifies changing the underlying date or amount.