IANA time zone name, such as America/New_York, to read the range in your own days. With it, start_date and end_date are calendar days in that zone, default to the 30 days before today there through today, and cover midnight on the first day to midnight after the last. Figures are summed from hourly delivery, and an hour counts toward the day it starts in. Without it, days are Pacific days. Hourly delivery starts at midnight Pacific on 2026-09-29, so with tz a range must start on or after the first full day that zone has (2026-09-30 in New York, 2026-09-29 in Los Angeles). An earlier start_date returns 400 naming that day, and an omitted one starts no earlier than it.

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