Older GPS receivers could believe it is 1999 again
On Saturday at 7:59:42 p.m. EDT (23:59:42 UTC), the constellation 31 active Global Positioning System (GPS) satellites will roll over the GPS week number, putting older receivers at risk of miscalculating the date back to 1999. This roll-over event is being called Y2K19.
Tony Rice, WRAL contributor/NASA ambassador