I'm sorry, the Instalment Due Date (auto debit date) and Tenure of an existing Recurring Deposit cannot be changed once set.
1. If you wish to invest more amount in Recurring Deposit please book a fresh (New) one with the tenure you wish too.
2. As the standing instruction date change option is not available for Recurring Deposit and you are in need of date change, I suggest to break the existing Recurring and book a new one on date you wish too.
3. There will be no interest for Recurring Deposit broken within one month from the date of its booked.