Regular trading hours for a symbol (IB)

I wonder if it is possible to get the regular trading hours for a symbol using IB API.

It is possible to get data with this function but how is it possible to also return the regular trading hours for this symbol ?

Tws1.reqHistoricalData(1, "MSFT", "STK", "", 0, "", "", "SMART", "usd", 0, "", 3600, 1 min, "TRADES", 1, 1);