Requesting the Earliest Data Point
EClient.reqHeadTimestamp (
tickerId: int., A unique identifier which will serve to identify the incoming data.
contract: Contract**.** The IBApi.Contract you are interested in.
whatToShow: String. The type of data to retrieve. See Historical Data Types
useRTH: int. Whether (1) or not (0) to retrieve data generated only within Regular Trading Hours (RTH)
formatDate: int. Using 1 will return UTC time in YYYYMMDD-hh:mm:ss format. Using 2 will return epoch time.
)
Returns the timestamp of earliest available historical data for a contract and data type.