datetimes!@jeder i keep saying that this are good years to start using Roman numerals. "I-XII" will always be month, and the year will possibly be "IVXL" by 2034, until then reaching XXXIII. And then leave the day in decimal (or hexadecimal if you wanna switch colors or add one more handwritten stroke for the one more bit)
I use that in my notes and it's comfy
also in handwriting you can just draw an analog clock when needed, with one or two hands for added precision. One could make vim/emacs render that too
