Title text:
It has been −2,147,483,648 days since our last integer overflow.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3228/
this post was submitted on 03 Apr 2026
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They're using a signed 32-bit integer which can overflow to negative numbers. An unsigned integer would roll over to just 0, but then the joke wouldn't work.
Edit: I misread the question and was thinking about the title text