ZenXArch's Zombie apocalypse

So I have implement difficulty into the game. So the difficulty is divided into three phases.

First Five days -> Zombies spawn slowly and without armor.

First Fifty days -> Zombies spawn fast with passing days. They can spawn with armor (less powerful than diamond armor) with max 10% chance. Enchanted armor (always cause yeah alpha) not treasure.

Then upto 250 days -> Zombies spawn faster and faster. Zombies spawn with armor (including more powerful than diamond) (50% normal armor and 5% rare armor). 5% chance of spawning with shield. Zombies spawn with enchantments (every single one) including treasure enchantments.

Also modded armor/swords/enchantments are supported.