Among the best best engineering documents I’ve read, written in a tone of gibbering madness, was a Google one about how Calendar handled time zones.

It has since been taken down by the Borg and replaced with a soothing lie. https://twitter.com/swiftonsecurity/status/635644114277535744

“What happens if you have an event happening in multiple time zones and reschedule it?”

// Increment the following counter for number of staff engineers who quit after ignoring the advice of this comment and trying to delve deep here: