WeekFieldsISOweekBasedYear
WeekFieldsISOweekBasedYear refers to the ISO week-based year as used in the ISO-8601 week date system. In the Java time API, it is exposed as the ISO-defined week-based year field, available through WeekFields.ISO.weekBasedYear() (a TemporalField). The week-based year identifies the year associated with a date when it is expressed in ISO week-date terms.
The ISO week date system defines weeks that start on Monday and assigns week numbers so that
Purpose and usage: Week-based year is used when working with ISO week dates, allowing calculations and formatting
In practice, you typically pair the week-based year with WeekFields.ISO.weekOfWeekBasedYear() to obtain a complete ISO week