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xkcd #2937: Room Code
(imgs.xkcd.com)
Alt text:
Sorry to make you memorize this random string of digits. If it helps, it can also double as a mnemonic for remembering your young relatives' birthdays, if they happened to have been born on February 5th, 2018.
When you plan your work on weekly sprints, week numbers become second nature.
Yeah but that defeats the purpose of an universal format.