The latest date for which data should be returned. It cannot be later than now. See the
interval data overview
for details about the defaulting behavior when this parameter is not provided.
If provided, it's recommended that end date align with the requested summary level;
otherwise, it will be rounded down to the next appropriate interval boundary. For example, a request
with a summary level of day and an end date of 2025-09-01T00:01:00Z will return data beginning
2025-09-01T00:00:00Z.
The value can be an RFC3339 timestamp, an unambiguous prefix of a RFC3339 timestamp (if offset omitted, UTC is assumed),
seconds since unix epoch, or milliseconds since unix epoch.
The value is treated as exclusive, meaning that data up until (but not through) the specified end is
included in the response; i.e., this models a standard right-open interval.