Yup, I had a mare that went 365 days like clockwork! The first year it almost killed me since I was never told that from the breeder I purchased her from. But the second year, I was a bit more relaxed, and kept checking the dates, and sure enough.....365 days again!
She had several foals for me before I sold her to a friend. I shared the 365 saga with her, but she didn't believe me, until once again, baby came to ground at 365 days! LOL