我如何获得日期差? [英] How can i get the Date Difference?

问题描述

我正在计算testapp中两个日期之间的差异.如果我不更改月份，它会很好，但是当我更改月份时，它将不起作用.请帮助我，这里是我正在使用的代码:-

I am calculating difference between two dates in my testapp. It works fine if I don't change the month but when i change the month it doesn't work. Please help me here is code I am using:-

NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];
//[df setDateStyle:NSDateFormatterMediumStyle];
df.dateFormat = @"YYYY-MM-DD";

NSDate *date1 = [df dateFromString:@"2011-04-30"];
NSDate *date2 = [df dateFromString:@"2011-05-03"];

NSLog(@"date1=%@",date1);
NSLog(@"date2=%@",date2);
NSTimeInterval secondsBetween = [date2 timeIntervalSinceDate:date1];

int numberOfDays = secondsBetween / 86400;

NSLog(@"There are %d days in between the two dates.", numberOfDays);

输出为-27.我感到困惑.

output is -27. I am confuse.

请任何人帮助我解决此问题.

please anyone help me to fix this problem..

推荐答案

尝试一下

NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];
        //[df setDateStyle:NSDateFormatterMediumStyle];
        //df.dateFormat = @"yyyy-mm-dd";
    [df setDateFormat:@"yyyy-MM-dd"];
    NSDate *date1 = [df dateFromString:@"2011-04-30"];
    NSDate *date2 = [df dateFromString:@"2011-05-03"];

NSLog(@"date1=%@",date1);
NSLog(@"date2=%@",date2);
NSTimeInterval secondsBetween = [date2 timeIntervalSinceDate:date1];

int numberOfDays = secondsBetween / 86400;

NSLog(@"There are %d days in between the two dates.", numberOfDays);

调整时区以获取正确的日期...

Adjust the time zone to get the correct dates...

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