Every ad account is assigned a currency and timezone at the moment it's created, and both are permanently fixed — the only way to change either is to create an entirely new ad account. This affects everything from how daily budgets reset to how performance reports align with a client's own fiscal calendar or local currency accounting.
Agencies provisioning new agency ad accounts confirm the correct currency and timezone before the account starts running any campaigns, since discovering a mismatch after weeks of spend means either living with the mismatch or migrating campaigns to a freshly created account.

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