Version 0.9.1

Yuki's Unambiguous Time-Keeping Notation is largely compatible with modern date formats, but uses different Unicode characters to unambiguously differentiate date and time components, while being easy to read given prior knowledge of Western time measurement. Hence, ISO 8601-style ordering and formatting is recommended, but optional.

2001-02-03 04:05:06 (in ISO 8601 format) can be written as 2001.Ⅱ.③;🕓⁰⁵ᵃ06.789.

Can be anything, including space, dash, slash, dots, colons, semi-colons, commas, vertical bars, nothing at all, or any combination thereof.

Written as Western Arabic numerals. The century can be omitted if it can be inferred from context.

Written as Roman numerals 1 to 12, corresponding to the month number.

Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻ

ⅰ ⅱ ⅲ ⅳ ⅴ ⅵ ⅶ ⅷ ⅸ ⅹ ⅺ ⅻ

Written as circled numerals. Can also be Arabic numerals enclosed in parentheses.

⓪ ① ② ③ ④ ⑤ ⑥
⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬
⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳
㉑ ㉒ ㉓ ㉔ ㉕ ㉖ ㉗
㉘ ㉙ ㉚ ㉛

⓪ can be specified to mean the last day of the previous month.

Written as black circled numerals.

⓿ ❶ ❷ ❸ ❹ ❺ ❻ ❼ 

With no day specified, a subscript numeral can be used to specify a number of weeks.

Ex. 2023Ⅹ❺₃ is the 3rd Friday of the month.

With a w specifier and no month specified, it can be used as an ISO week number.

Ex.: ❺_w50 is Friday of Week 50.

Ex.: 2023_w50 is Week 50 of 2023.

Ex.: 2023Ⅹ₀ is the last week of September 2023, before the first week of October.

Written using clock emoji, using 30-minute intervals.

ᵃ and ᵖ are used after the appropriate symbols for respectively AM and PM. Optionally, a number of minutes (counted from the top of the hour) can be specified in superscript before the AM/PM symbol.

Ex.: 16:59 would be written as 🕟⁵⁹ᵖ.

Ex.: 04:30 am can be written as 🕟ᵃ.

*to be specified*

• Some characters may be hard to read, or look inconsistent. Please use plain ISO 8601.