Comment by bigiain
18 hours ago
I suspect most IOT device manufacturers expect/design their device to be landfill before worrying about leap year math. (In my least optimistic moments, I suspect some of them may intentionally implement known broken algorithms that make their eWaste stop working correctly at some point in the near future that's statistically likely to bear beyond the warranty period.)
"Is year divisible by four" will work perfectly fine for the next 75 years. Random consumer devices are definitely not going to survive that long, so being capable of dealing with it adds exactly zero value to the product.
It's hard to imagine being in a situation where the cost of the additional "year divisible by 100" check, or even the "year divisible by 400" check is too much to bear, and it's trivial enough that the developer overhead is negligible, but you never know when you need those extra handful of bytes of memory I guess...