Feb to Feb is arbitrary, or Oct to Oct. There are fundamental reports that gets released in the middle of the year like GDP. What if I do March - March and GDP gets release April 1st / 2nd?
A 365-day tenor will include exactly one instance of any annual event, no matter when it starts.
I'm just going to let this go. No insult intended, but if you don't understand the absolutely obvious fact above, trying to explain is futile.