A literary appreciation of the Olson/Zoneinfo/tz database
blog.jonudell.net/2009/10/23/a-literary-appreciation-of-the-olsonzoneinfotz-database
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
You will probably never need to know about the Olson database, also known as the Zoneinfo or tz database. And were it not for my elmcity project I never would have looked into it. I knew roughly that this bedrock database is a compendium of definitions of the world’s timezones, plus rules for daylight savings transitions (DST), used by many operating systems and programming languages.