Does Nanjing Epidemic Prevention Center send a short message at twelve o'clock in the evening?

The SMS notification from Nanjing Epidemic Prevention Center will not be sent at 12 o'clock in the evening. Anti-epidemic SMS is not a mass message, but an individual who travels with a mobile phone, tracking the travel trajectory according to the mobile phone signal. If the mobile phone number has recently entered or stayed in a city or region in a high-risk area of COVID-19, it will automatically send an epidemic prevention message to the mobile phone user, reminding the user to report his trip to his community or street in time and accept local epidemic prevention management measures.