Title text:
All discussions of daylight saving time policy are doomed by a mix of contradictory, inconsistent, and impossible preferences, which is why I think the only thing we can really hope to do is to make it worse.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3272/
That's leap days. We also skip leap minutes occasionally. I think we've only removed whole years in retrospect.
Leap year is the term for the year a leap day occurs in. I also don't believe there have ever been full leap minutes, just leap seconds.