Assuming correct implementation of the NTP spec and adherence to the "eras" functions, NTP should be resistant to this failure in 2036.
The problem being so many micro-controllers, non-interfaceable or cheaply designed computers/devices/machines might not follow the standards and therefore be susceptible although your iPhone, Laptop and Fridge should all be fine.
The problem being so many micro-controllers, non-interfaceable or cheaply designed computers/devices/machines might not follow the standards and therefore be susceptible although your iPhone, Laptop and Fridge should all be fine.