The timestamp the data is returned starting from in RFC3339 format (including timezone specification). Defaults to end minus period
If provided, the start value is always normalized to the America/New_York timezone and adjusted to the nearest timeframe interval, e.g. seconds are always truncated and the time is rounded backwards to the nearest interval of 1Min, 5Min, 15Min, or 1H.
If timeframe=1D and start is not a valid trading date, find the next available trading date. For example, if start occurs on Saturday or Sunday after converting to the America/New_York timezone, start is adjusted to the first weekday that is not a market holiday (e.g. Monday).
If timeframe is less than 1D and intraday_reporting is not continuous, start always reflects the beginning of a market session. If start is between midnight and the end (inclusive) of an active trading day, start is set to the beginning of the session on the specified day. Otherwise, if start occurs outside of the market session, the next available market date is used.
For example, when intraday_reporting=market_hours and start=2023-10-19T23:59:59-04:00, the provided start date occurs outside of the regular market session. The effective start timestamp is adjusted to the beginning of the next session: 2023-10-20T09:30:00-04:00
start may be be combined with one of end or period.
Providing all of start, end, and period is invalid.