A perpetual calendar watch is like a well-written program with a leap year rule hardcoded: "Every 4 years is a leap year." Theek hai? But the real calendar has an exception: years divisible by 100 are not leap years, unless also divisible by 400. So in 2100, that exception kicks in, and the watch will get it wrong, adding a day it shouldn't.
I see this in my old gym registers—my handwritten schedule for the boys assumes every fourth year is the same, but even my routine had to change when my daughter fixed my diet. Machines, like old men, sometimes miss the fine print, samjhe?
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