计算日历周

Question

我该如何计算日历周？一年有52/53周,有两个规则:

-美国

-DIN 1355/ISO 8601

我想使用DIN 1355/ISO 8601.我该如何管理？

编辑:

NSDate *today = [NSDate date];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"ww"];
NSString *weeknumber = [dateFormat stringFromDate: today];
NSLog(@"week: %@", weeknumber);

取自http://iosdevelopertips.com/cocoa/date-formatter-examples.html

我在哪里可以找到允许的日期格式？

Answer 1

使用NSCalendar和NSDateComponents.

NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:NSWeekCalendarUnit fromDate:date];
NSInteger week = [components week];