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  • Nice find! Do you think you could add the content of the tweet to your message in case the image is deleted? Commented Nov 30, 2021 at 15:38
  • I screenshotted the image and uploaded it on SE, so it shouldn't ever get deleted. Commented Nov 30, 2021 at 15:47
  • @connexo Famous last words! I hope you're right. :) Commented Nov 30, 2021 at 15:59
  • This legacy originates with Taligent. Sun licensed their Calendar implementation from IBM. Fun fact: it supports 13 months so 12 is a valid month called 'Undecimber'. Commented Nov 30, 2021 at 16:28