I notice today is September 15th, which is about 6 months after (or before) March the 15th, famously known as the Ides of March (and not much loved by Caesar).
In geography, an antipode is the location on the Earth's globe that is directly opposite where you start from. Is there an analogous word for describing "a date that is six months away from a particular date?"
Note: I'm not looking for words like semi-annual. I would like to say: "Today is the [year-antipode] of the Ides of March."