Been thinking for some days about the arvelie date system (https://wiki.xxiivv.com/site/arvelie.html) by Devine Lu Linvega (npub1z8r…mrq6) .
Here's a twist if only week precission is needed, although it could be eventually adapted to days as well: use katakana.
First week is ア, then we go through イ, ウ, エ, オ. Sixth week is カ, etc.
This system would imply using obsolete kana for yi (𛄠), ye (𛄡) and wu (𛄢). 51th week would be ン. For weeks 52 and 53 something like koto (ヿ) and yori (ゟ) could be used. OK, I cheated with the last one because it's hiragana, but there's no Unicode point code for katakana yet AFAIK.
00ネ: year 0, week 24.
06モ: year 6, week 35.
12ワ: year 12, week 46.
#Japanese