Hi Sudhakar,
Thank you for reaching out to us. I see that you have concerns on reporting date ranges. You can see
here for more on specifying custom date ranges and how to pull metrics from multiple periods/days. If you give 2018-04-17 in your query, you'll receive metrics that are only from that day. Let me know if you have further questions.
Thank you,
Bryan, Google Ads API Team

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