Honey never goes bad.
However, natural raw honey will eventually crystalize. The amount of time that honey takes to crystalize depends on the amount of particulate matter in the honey. Not to worry. Particulate matter is the good stuff left behind by the bees, like fine bits of wax and pollen. If you have some honey that is crystalized you may eat it as is, or you may re-liquify it. Please do not be tempted to accomplish this by using a microwave. You may inadvertently destroy the enzymes. Simply boil a pot of water and remove from the heat. Place your jar of honey in the hot water and it will slowly dissolve the crystals.