https://codeofmatt.com/list-of-2020-leap-day-bugs/ Code of Matt * About the Author 29 February 2020 / leap-year List of 2020 Leap Day Bugs The following is a list of many bugs caught on or near leap day, February 29th, 2020. Each link below references the issue with supporting details where available. This list does not include bugs that were already caught and repaired before they could have impact on leap day. Last updated 2020-02-29 2:45 PM PST Verified / Unresolved Items in this section have been verified, and have not yet been resolved. * Many people reported their cell phones were showing Feb 28th when it was actually Feb 29th, or some variation of showing the wrong date. Most appear to be on the Sprint network, and for at least one, Sprint confirmed the issue and stated they were working on it. Reports: 1, 2, 3, 4, 5 * Players of the video game Tropico 6 encountered a crash on the loading screen. The error message shows an Invalid Date error, with a date of 2019-02-29 (2019 is not a leap year). Reports: 1 , 2, 3, 4, 5 * Users of gohenry, a pocket money management app for children and parents, had an issue with scheduled allowances not being paid on Feb 29th. Reports: 1, 2, 3, 4, 5 * AppDaemon open source home automation software crashed on leap day due to trying to create a date of 3000-02-29. (The year 3000 is not a leap year.) More details in the related GitHub issue. * An automated streetlight system failed to operate correctly for the entire city of Aalborg, Denmark's fourth largest city. It took a few hours of darkness before the city's operations manager could figure out the problem and turn the lights on manually. Verified / Uncertain Cause Items in this section have been verified to have occurred near the leap day, but may or may not have been caused by a leap year bug. * National Australia Bank's merchant and business banking facility, NAB Connect, had an outage that started around lunchtime on Feb 28th. It was reported resolved as of 9 PM local time on Feb 29th. It may or may not have been caused by a leap day bug, but at least one person felt that it was, and several customers have complained to NAB on social media, including this one. * A software glitch in the HR software for the Tamil Nadu, India government, delayed salaries for several government employees on Feb 29th. (It is unclear if this was caused by leap year bug, or some other unrelated issue.) Unconfirmed These items surfaced during my search or were brought to my attention by others, however I have not been able to confirm their validity. They may possibly not have happened at all. * Some reported the date on their wristwatch skipped over the leap day, including a Timex Expedition watch, and a Casio watch. * A user of the app for a Portuguese grocery store, Pao de Acucar, highlighted a possible error with the app on Feb 29th. * A person reported a possible bug with Patreon * A person reported that all the key cards and elevator in their hotel stopped working because of the leap year. * Some people reported probable leap year bugs with their Amazon purchase experiences. Reports: 1, 2 * Several users of Google Maps have seen wildly incorrect routes for transit navigation on in King County, Washington, USA on Feb 29th. It's unclear if the issue is with Google Maps, or with the underlying data source. Reports: 1, 2 * A person reported that all of the Yealink T56 business desk phones displayed February calendar events for the wrong day. * One person reported that LinkedIn listed the time they had been with their current employer incorrectly. Verified / Resolved Items in this section had an impact on or near February 29th, were verified as bugs, and are now resolved. * Users of Shadow, a gaming streaming service, encountered an "L-104 error" when trying to log in from Windows PCs, starting at 4 PM PST on 2/28 (which is midnight UTC on 2/29). The company originally asked their users to work around the bug by disabling time synchronization and set their clocks forward to March 1st. They issued an update about 91/2 hours later correcting the problem, and then asked users to turn time synchronization back on. Full discussion on Reddit. (Excellent transparency here, but I don't recommend disabling time sync. That can lead to many other issues.) Verified / Resolved / Unknown Impact Items in this section are also verified and resolved, but the vendor did not supply any supporting details as to what problems they actually had. * (None yet, reserving this section for future updates to this post.) Verified / Deferred Items in this section had an impact on February 29th, but resolved themselves on March 1st without any specific fix or resolution reported. One assumes that the vendor will take appropriate action before the next leap day in 2024, or has already taken such action, but to the best of my knowledge no confirmation has yet been provided. * (None yet, reserving this section for future updates to this post.) Honorary Mention * Timehop, which made my list from 2016 also, did indeed decide that it's not a bug but a feature! (and with a funny error message graphic!) * Bantshire University (a parody account, not a real university), let us know that all IT systems are offline due to a complication with a date of March 0th. * Many developers mentioned that they encountered leap year bugs in their own code. Thanks for sharing! 1, 2, 3, 4, 5, 6, 7 * Not a bug, but something to drink while you fix your bugs now, so they don't blow up next time around in 2024. Resources You might also be interested in these other articles I've authored on the subject of leap year bugs: * On the Life Cycle of a Leap Year Bug * It's 2020. Is your code ready for leap day? * List of 2016 Leap Day Bugs * Leap year bug - Wikipedia * What are some examples of leap year bugs? - Stack Overflow Please let me know (in comments below, or send me a DM on Twitter) if you have any corrections or additions. Thanks. Matt Johnson-Pint Matt Johnson-Pint Read more posts by this author. Read More -- Code of Matt -- leap-year * On the Life Cycle of a Leap Year Bug * List of 2016 Leap Day Bugs * Happy New LEAP Year! See all 3 posts - date-time On the Life Cycle of a Leap Year Bug Back in 2016, I wrote about leap year bugs. Since another leap year is almost here, I figure it's time to revisit the subject. I've gathered quite a bit of knowledge in this * Matt Johnson-Pint Matt Johnson-Pint 2 min read Code of Matt -- List of 2020 Leap Day Bugs Share this Code of Matt (c) 2020 Latest Posts Twitter Ghost