Hi Hao Xi, Thank you for reaching out to us. I see that you want to get the creation and and termination date for your campaigns. In the campaign report, you can query the campaign.start_date and campaign.end_date, as well as having the same attributes for the campaign object. The change_status's last_change_date_time field is when the campaign or ad group last had a changed applied to it. Let me know if you have further questions.
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