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wrong yearOfWeek/weekOfYear for gregory calendar #53

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o-t-w opened this issue Jan 6, 2025 · 0 comments

o-t-w commented Jan 6, 2025 •

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I am basing the correct behaviour based on how the Firefox implementation works.

For the ISO calendar, I would expect, and I get the following results:

const lastDay2029 = Temporal.PlainDate.from('2029-12-31');
console.log(lastDay2029.weekOfYear) // 1
console.log(lastDay2029.yearOfWeek) // 2030

Using the polyfill, I get the same results as those above when using the gregory calendar, whereas in Firefox I get:

const lastDay2029 = Temporal.PlainDate.from('2029-12-31[u-ca=gregory]');
console.log(lastDay2029.weekOfYear) // 53
console.log(lastDay2029.yearOfWeek) // 2029

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