面试准备第九篇

```日历

NSCalendar *calendar    = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierChinese];// 农历

NSDate *currentDate = [NSDate date];

NSInteger weekIndexOfYear = [calendar ordinalityOfUnit:NSCalendarUnitWeekday

inUnit:NSCalendarUnitYear

forDate:currentDate];

NSLog(@"今天是今年的第%ld周",weekIndexOfYear);

NSInteger dayIndexOfMonth = [calendar ordinalityOfUnit:NSCalendarUnitDay

inUnit:NSCalendarUnitMonth

forDate:currentDate];

NSLog(@"今天是本月的第： %ld 天",dayIndexOfMonth);

```