End time of the query period.
Retrieves candles that occurred before the specified time.
If not provided, the most recent candles based on the request time are returned by default.
Specify the time in ISO 8601 datetime format.
When making the actual request, ensure that any spaces or special characters in the datetime string are properly URL-encoded.
[Example]
2025-06-24T04:56:53Z (UTC)
2025-06-24 04:56:53 (UTC)
2025-06-24T13:56:53+08:00 (SGT)
