This now matches how Tradestation and Multi-Charts work. The only difference is session times in GSB are related to the time stamps on the data,

while TS & MC session times are in exchange time - even if the chart is on local time.

The session close is used for end of day exit and setexitonclose command.

setexitonclose is used in easy language for end of day exits. This may not work for live trading a TS/MC  brokerage account.

Note multiple session times are allowed per day. For example