Hello,
In general all the reports that are pulled from a account will be based on the account's time zone. Even here the hours pointed to the timezone of the account to which the API call is made. In your query you can add the attribute like
ad_group.id or
ad_group.name so that the metrics will be meaningful. Please let me know if you have any further questions.
Regards,
Sai Teja, Google Ads API Team

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