GTD refers to ‘Good Till Day’. In the event that these orders do not get executed immediately, they remain pending until the end of the trading day. After which, the exchange cancels all the pending orders.
Kindly make sure you read the account opening documents as prescribed by SEBI. Secure your account from unauthorized transactions by updating your mobile numbers/email IDs. Receive information directly from the Exchange on your mobile/email at the end of the day. Issued in the interest of the investors. Write to email@example.com for support related queries / complaints or firstname.lastname@example.org for account opening queries / complaints. You can send feedback to email@example.com. A client can also opt to write to NSE here or MCX here or BSE here.