ASK HN: DID YOU ENCOUNTER ANY LEAP YEAR BUGS TODAY? (HACKER NEWS THREAD)

Summary from the TLDR newsletter

An extra day in the year can have interesting consequences. This Hacker News thread discusses bugs that users observed on February 29. Bugs were seen in card payment systems, parcel delivery websites, and daily post bots. China's app for scheduling marriage certificates apparently has a leap-year bug that prevents people born on February 29 from making appointments as it marks them as too young to marry legally.