No, it is not possible to trade when stocks markets are closed. However, you can place an After Market Order(AMO), which will be executed after the markets open on the consecutive trading day. These orders can be modified any number of times until they get executed,
Is it possible to trade in non-market hours?
The short answer is No, you cannot trade while the stocks makers are closed or in non-market hours. The Indian trading timing is from 9:15 A.M to 3:30 P.M. Out of which 9:00 A.M to 9:15 A.M is the pre-market hours where you can place your traders but you can exit it only after 9:15 AM. Similarly, you can place and execute any trade within this time frame, from 9:15 am to 3:30 pm.
However, there are some other methods to place a trade after market hours, with the help of an AMO (After Market Order). An AMO helps you to place an order to buy or sell a stock after the markets are closed. These orders get executed only after markets open on the next trading session. You can place a Limit Order or a Market Order, depending on your
Conclusion
To conclude it is not possible to actively trade in the non-market hours, but you can place an AMO order post-market hours for the next trading session. Similarly, you can place an AMO order in trading holidays where the markets remain closed. These orders can be modified or canceled an end number of times until they are executed.