The yogurt from the fridge is very old. So old, in fact, that it may (humorously) predate the switch to the Gregorian calendar in the mid 18th century.
The Author is making a joke about how sometimes things in your fridge are very old.
Notes
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xkcdexplainedexplained reblogged this from xkcdexplained and added:
Toby, Dave, and Ian are getting better at using correct grammar and punctuation, but still forgot a hyphen. Can you...
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jennyjenjen reblogged this from xkcdexplained and added:
xkcdexplained uses...its explanations. I mean, without
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