IsoWeek

A week of an ISO 8601 week-numbering year, written 2026-W43: week from 1 to 52, or 53 in a year that has one.

Time and calendar; ordered; since Jadpo 0.1.0.

Make one

Build one from its fields, IsoWeek { year: ... week: ... }.

text.parse(raw, as: IsoWeek) reads one from its text; text that isn't one at all fails malformed, such as 2027-W53, 2026-W54 or 2026-W00.

Its parts keep these rules; a value that breaks one fails with the rule's name:

• week_in_year: week is 53 only in a year with 53 ISO weeks

Fields

Text, JSON and storage

text.from writes its canonical text, the one form text.parse reads back. JSON sends its canonical text as a string.

It is stored in 2 columns, each named for the field, _ and its suffix. This is 2026-W53:

Shown to people

text.format(value, locale:) shows it to people in their locale.

With locale: Locale.en_gb:

Operations

It has the contract's own operations: text.parse, text.from, text.format, json.read, json.write and ==. It is ordered, so < and sorting take it. Every standard type meets one contract says how they work.