When a kernel commit starts with "In A.D. 1582 Pope Gregory XIII found that ..." you know you're in for a ride:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f076ef44a44d02ed91543f820c14c2c7dff53716
tl;dr: Rockchip decided November should have 31 days...
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