计算Objective-C中两个日期之间的天数 [英] Calculating the number of days between two dates in Objective-C

问题描述

可能重复:
如何比较两个日期，返回一个数字的天数

Possible Duplicate:
How can I compare two dates, return a number of days

我有两个日期(例如NSString，格式为"yyyy-mm-dd")，

I have two dates (as NSString in the form "yyyy-mm-dd"), for example:

NSString *start = "2010-11-01";
NSString *end = "2010-12-01";

我想实施:

- (int)numberOfDaysBetween:(NSString *)startDate and:(NSString *)endDate {

}

推荐答案

NSString *start = @"2010-09-01";
NSString *end = @"2010-12-01";

NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:@"yyyy-MM-dd"];
NSDate *startDate = [f dateFromString:start];
NSDate *endDate = [f dateFromString:end];

NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorianCalendar components:NSCalendarUnitDay
                                                    fromDate:startDate
                                                      toDate:endDate
                                                     options:0];

components现在可以保存差异.

NSLog(@"%ld", [components day]);

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