I got a fight recently with a philosophy teacher about that, I changed the dates like the op to be more clear on my writing, she took it so seriously, it was a big fight about clarity vs. tradition but really superficial and mean on both sides. Now I wish to be* more articulate and have a good debate. I wrote it in my way on the final exam and approved, she had to deal with it I guess.

* Sorry, I don't know how to write that in past, like haber sido in Spanish, my main language.