Worth reading! In a stream of tweets from John Feminella:
One of my clients is responsible for several of the world’s top 100 pension funds.
They had a nightly batch job that computed the required contributions, made from projections 20 years into the future.
It crashed on January 19, 2018 — 20 years before Y2038.
The person who originally wrote it had been dead for at least 15 years, and in any case hadn’t been employed by the firm for decades.