I know the middle phrase isn't accurate, but tell me:

When you hear these phrases, what year do you associate them with?

I got in an interesting discussion with my boss recently. We were talking about when our pipes froze one year at my job, and I said, "Yeah, that was in 2022, right?"

And they said, "Yeah, Last Christmas. One year and one month ago."

I can't grasp this, because when I hear someone say "Last Christmas", (outside of the song), I think of 2023-because it was technically, last year. But they are adamant that it was in 2022.

I am understanding that to say "Last Christmas" we are leaving out the word "year's" that is implied in the phrase. So, "Last (year's) Christmas, I got a giftcard."

I thought if I were to say, "Last Thanksgiving", I would think of 2023. Such as, "Last Thanksgiving, I ate turkey."

I majored in English, so am I, like, out of the loop with the world? I need some semantic scholars and linguistics here. Help.

*I purposely capitalized Last, just to distinguish it, but now I don't know if that should always be capitalized.