Daylight saving time. When you spring forward, the day is 23 hours long. When you fall back, the day is 25 hours long.

Lord Howe Island in Australia shifts by 30 minutes, so the days there are 23.5, 24, or 24.5 hours OK, let's forget about hours. Let's talk about seconds and minutes.

Ever heard of leap seconds? * Accommodate for random fluctuations in the rotation of the earth * Announced 6 months in advance * Abolished starting 2035 * So far, only added and never yet subtracted * In POSIX, we pretend they don't exist and hope for the best

clock forward at midnight - day starts at 1:00

clock backwards at midnight - day starts twice

30 minutes: India (one-sixth of the world's population!), Sri Lanka, Afghanistan, Iran, Myanmar, Marquesas Islands, several time zones in Australia, one time zone in Canada

45 minutes: Nepal, one time zone in Australia

This may not exist anymore, but in the computing era, as recently as 1972, Liberia had a time zone offset of 44 minutes 30 seconds.

We're just gonna leave you with this fun story. Pause the frame if you're watching the stream. Thank you.