GSTN is doing a Disaster Recovery Drill of GST system on September 01, 2019 between 00:01 AM to 05:00 AM. The drill will take approximately 5 hours. The timing of the drill is chosen so that the taxpayer will not face any hardship from the Disaster Recovery Drill of the GST system.
The GSTN has also announced that the GST system services will NOT be available during the mentioned time. They have also requested all the taxpayers to plan their GST Compliance Activities accordingly.
Source: GSTN