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Your campaigns will run in the time zone selected on account setup. 

Currently, there is no way to customize time zones per campaign, and all your campaigns must run in the same time zone.

Analytics dashboards are set to your billing time zone. This is clearly highlighted within each dashboard.

If you would like to change the timezone of your ads account, please submit a support ticket by visiting ads.twitter.com and clicking on the “Help?” button. From there, our Ads Support team will create a new ads account in addition to your existing Twitter Ads account, where you'll be able to select a new time zone and/or currency. Unfortunately time zones are not changeable on existing ads accounts once they are set. 

Please note, if you had campaigns on the existing account you will need to pause or stop those campaigns to prevent future charges from accruing. Customers are responsible for charges accrued in all Twitter Ads accounts associated with their handle, irrespective of time zone or currency settings.