penwing reads (they/them) quoted The Left Hand of Darkness by Ursula K. Le Guin (Hainish Cycle, #4)
On the planet Winter, there is no gender. The Gethenians can become male or female …
It is always Year One here. Only the dating of every past and future year changes each New Year's Day, as one counts backwards or forwards from the unitary Now.
— The Left Hand of Darkness by Ursula K. Le Guin (Hainish Cycle, #4) (Page 1)
Page 1 and le Guin has already broken my brain with that... A completely relative dating system is just arghhhhhh