Apple has issued a notification on its support page asking users of older iPhones and iPads introduced in 2012 and earlier to update the iOS that Apple will release. This patch will iron out the GPS bug that causes issues with location, date and time. This is due to the GPS time rollover issue that began affecting GPS-enabled products from other manufacturers on April 6, 2019. However, the mentioned Apple devices are not impacted until just before 12:00 a.m. UTC on November 3, 2019.
If you own an iPhone 5, iPad (4th generation) Wi-Fi + Cellular. iPhone 4S, iPad mini (1st generation) Wi-Fi + Cellular, iPad 2 Wi-Fi + Cellular (CDMA models only) and iPad (3rd generation) Wi-Fi + Cellular you will require to update the same before November 3 to make sure that its GPS, date, and time continue to work properly.
If you miss updating the latest version of iOS before November 3, some models might not be able to maintain an accurate GPS position. This will lead to malfunctioning of apps like iCloud and fetching email—might as they rely on time and date. After November 3, you can update the device via iTunes as the OTA update will not be available.
This issue does not affect iPod touch or any iPad models that have Wi-Fi only. It also doesn’t affect iOS devices newer than those mentioned above.