从当前日期减去7天 [英] Subtract 7 days from current date

问题描述

看来我不能从当前日期减去7天.这就是我的做法:

It seems that I can't subtract 7 days from the current date. This is how i am doing it:

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setDay:-7];
NSDate *sevenDaysAgo = [gregorian dateByAddingComponents:offsetComponents toDate:[NSDate date] options:0];

SevenDaysAgo与当前日期具有相同的值.

SevenDaysAgo gets the same value as the current date.

请帮助.

在我的代码中，我忘了用正确的日期替换获取当前日期的变量.因此，上面的代码可以正常工作.

In my code I forgot to replace the variable which gets the current date with the right one. So above code is functional.

推荐答案

使用dateByAddingTimeInterval方法:

use dateByAddingTimeInterval method:

NSDate *now = [NSDate date];
NSDate *sevenDaysAgo = [now dateByAddingTimeInterval:-7*24*60*60];
NSLog(@"7 days ago: %@", sevenDaysAgo);

输出:

7 days ago: 2012-04-11 11:35:38 +0000

希望有帮助

这篇关于从当前日期减去7天的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！