Just dug some out of the cupboard to use for dinner tonight. Some of it's still runny but the rest is solid. It's dated Feb 12...kitchen is quite cold so could that be the reason?
Honey does not go "OFF" just turns solid as yours seems to have done. All you have to do is warm, and I mean only warm, some water and place the container in it until the solid part becomes liquid again. Alternatively, remove the top and place in a microwave for a few seconds, check and repeat the process but do be careful and do not overheat the container if glass or plastic.
Honey packers are required to show a 'best before' date, or 'best before end' followed by the year, marked on the jar. They usually opt for a date 18 months from packing, or year only if it's to be more than 18 months. In fact, honey will stay in good condition for years longer than any date shown.