script needed exit position at the end of session ES @ 15:15

someone please help....
script needed exit position at the end of session ES @ 15:15
I want to backtest ES, but i needed it to exit all position at end of session at 15:15CT, currently positions carry over to next morning, which is unbearable on somedays which market goes against you. Thanks

I attach a good pic example, MC went short 5min before closed and next morning gap up about 5 points. $500 lost if i hold 2 contracts.
In quote manager...session's source; should have a check box to exit all positions at session end.