The prison authority sent a notice to the family of the death row inmate to inform about the date of execution and ask them to make required funeral arrangements.
The announcement follows the terror attack on two mosques in the southern city of Christchurch that left at least 50 persons dead and another 50 injured.
The shock of the attacks has led to calls for an immediate tightening of laws to restrict access to some firearms, particularly semi-automatic weapons.
Friday's attack, which Ardern labelled as terrorism, was the worst ever peacetime mass killing in New Zealand and the country had raised its security threat level to the highest.
Once the court released Siti Aisyah, she was immediately rushed to an elevator and was seen being escorted to an Indonesian embassy car waiting outside the courthouse.
Reportedly George R.R. Martin's masterwork fantasy saga is set to reveal its epic conclusion on HBO, and not on the printed page where he launched his tale 23 years ago.