YYYYWwwD
YYYYWwwD is a compact date-encoding scheme used in scheduling, data interchange, and file naming. It encodes a calendar date by concatenating a four-digit year, the literal character W, a two-digit ISO week number, and a one-digit day-of-week indicator. The day-of-week uses the ISO convention, where 1 corresponds to Monday and 7 to Sunday. The result is an eight-character string such as 2024W351, which represents Monday of week 35 in 2024.
The format is derived from the ISO 8601 week-date system, which defines a year by ISO weeks
Parsing and interpretation follow a straightforward rule set. An valid string must have length eight, with
Limitations include uneven support across software libraries and potential ambiguity near week-year boundaries. It is most