The ISO 8601 week date of the year.
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@property NSInteger weekOfYear;
This value is interpreted in the context of the calendar with which it is used—see Calendars, Date Components, and Calendar Units in Date and Time Programming Guide.
The number of the weekdays.
The ordinal number of weekdays.
The week number of the months.
The number of days.
Returns the number of weeks.
Sets the number of weeks.
The ISO 8601 week-numbering year.