Gamida
Hood Ornament
Not really. We humans would find an easier (lazier) way than that.This is the nerds' revenge.
People who cannot divide by 7 or tie their shoes without help... get eaten by zombies.
Even easier....well if the HUD showed "Year [n], Week [1-52], Day [1-7]" instead of just "Day [n]", that would take care of it.
We would just use addition. If we knew the horde came every 7 days we would just count from horde night until we hit the next 7. Then we would know it is horde night again.
Can't really seeing anyone thinking "Hmmmm, it is night 17752. So it's a horde night"
More likely it would be "Hmmmm, it's 7 nights from last horde. So it's a horde night"
See, lazier way is also so much easier.