NSDate获得上周,上个月的发行

时间:2013-03-25 09:33:21

标签: ios nsdate

我需要从当前日期开始上周和月。

所以我找到了可以重新计算当前日期添加间隔的解决方案

- dateByAddingTimeInterval

这就是它的代名词:

[[NSDate date] dateByAddingTimeInterval: -604800.0](上周获得)

[[NSDate date] dateByAddingTimeInterval: -2629743.83](上个月获得)

正如我认为一周这个方法运行良好没有任何问题,因为每周有七天,间隔不会改变。但是对于一个月我们有一个问题,因为每个月都有不同的天数。

2 个答案:

答案 0 :(得分:35)

使用NSDateComponents可以轻松准确

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps = [NSDateComponents new];
comps.month = -1;
comps.day   = -1;
NSDate *date = [calendar dateByAddingComponents:comps toDate:[NSDate date] options:0];
NSDateComponents *components = [calendar components:NSMonthCalendarUnit|NSDayCalendarUnit fromDate:date]; // Get necessary date components
NSLog(@"Previous month: %d",[components month]);
NSLog(@"Previous day  : %d",[components day]);

答案 1 :(得分:9)

请勿使用903484和-23484更改日期

这样做:

NSCalendar *gregorian=[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components=[[NSDateComponents alloc] init];

components.month=1;//next month
components.month=-1;//previous month
//similarly +1 and -1 will give you week and month day etc
components.week=1;
components.day=1;

NSDate *myMonth=[gregorian dateByAddingComponents:components toDate:today options:0];
NSDateComponents *components = [calendar components:NSMonthCalendarUnit|NSDayCalendarUnit fromDate:date]; 
NSInteger yourRequiredValue=[components day]; //day, month, week etc