The Global Positioning System (GPS) has its operates under a timescale of date time based on counting the weeks, and seconds inside a week. However, the field that contains the week number has a maximum of 1024 weeks, a GPS rollover event occurs when the counter reaches week 1023 and then rolls back to week 0.
Rollover occurs approximately every 20 years. The latest GPS week rollover occurred on April 6th, 2019.
The latest rollover week is the second time this has occurred. GPS week zero was in January 1980. The first rollover happened when the counter reached its maximum on August 21, 1999.
This may affect products that rely on GPS with the affected products will still showing correct position, but have the incorrect date and time. In worst case scenarios, position may be affected.