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Week Year
2.1.0
moment().weekYear(Number); moment().weekYear(); // Number

Gets or sets the week-year according to the locale.

Because the first day of the first week does not always fall on the first day of the year, sometimes the week-year will differ from the month year.

For example, in the US, the week that contains Jan 1 is always the first week. In the US, weeks also start on Sunday. If Jan 1 was a Monday, Dec 31 would belong to the same week as Jan 1, and thus the same week-year as Jan 1. Dec 30 would have a different week-year than Dec 31.