HeadTimestampRequest

Field	Type	Description
`reqId`	`int32`	Unique request identifier used for tracking across EWrapper
`contract`	`Contract`	Contract object containing defining characteristics for ticker.
`useRTH`	`bool`	Declare that the request should only include Regular Trading Hours. Extended trading hours will be excluded.
`whatToShow`	`string`	Data source type
`formatDate`	`int32`	Using 1 will return UTC time in YYYYMMDD-hh:mm:ss format. Using 2 will return epoch time