今天，昨天，这周，上周，这个月，上个月，获取NSDate ...变量
今天，昨天，这周，上周，这个月，上个月，获取NSDate ...变量
提问于 2009-12-12 00:23:56
我正在尝试做的是让NSDate今天，昨天，这周，上周，这个月，上个月的变量准备好比较，以便在UITableView的titleForHeaderInSection上添加标头
我想要的是在下面的代码中手动完成日期2009-12-11
NSDate *today = [NSDate dateWithString:@"2009-12-11 00:00:00 +0000"];
NSDate *yesterday = [NSDate dateWithString:@"2009-12-10 00:00:00 +0000"];
NSDate *thisWeek = [NSDate dateWithString:@"2009-12-06 00:00:00 +0000"];
NSDate *lastWeek = [NSDate dateWithString:@"2009-11-30 00:00:00 +0000"];
NSDate *thisMonth = [NSDate dateWithString:@"2009-12-01 00:00:00 +0000"];
NSDate *lastMonth = [NSDate dateWithString:@"2009-11-01 00:00:00 +0000"];回答 9
Stack Overflow用户
回答已采纳
发布于 2009-12-12 02:14:37
写这篇文章可能是一种更好的方式，但这里是我根据本的NSCalendar建议和从那里到NSDateComponents的工作
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:( NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond ) fromDate:[[NSDate alloc] init]];
[components setHour:-[components hour]];
[components setMinute:-[components minute]];
[components setSecond:-[components second]];
NSDate *today = [cal dateByAddingComponents:components toDate:[[NSDate alloc] init] options:0]; //This variable should now be pointing at a date object that is the start of today (midnight);
[components setHour:-24];
[components setMinute:0];
[components setSecond:0];
NSDate *yesterday = [cal dateByAddingComponents:components toDate: today options:0];
components = [cal components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:[[NSDate alloc] init]];
[components setDay:([components day] - ([components weekday] - 1))];
NSDate *thisWeek = [cal dateFromComponents:components];
[components setDay:([components day] - 7)];
NSDate *lastWeek = [cal dateFromComponents:components];
[components setDay:([components day] - ([components day] -1))];
NSDate *thisMonth = [cal dateFromComponents:components];
[components setMonth:([components month] - 1)];
NSDate *lastMonth = [cal dateFromComponents:components];
NSLog(@"today=%@",today);
NSLog(@"yesterday=%@",yesterday);
NSLog(@"thisWeek=%@",thisWeek);
NSLog(@"lastWeek=%@",lastWeek);
NSLog(@"thisMonth=%@",thisMonth);
NSLog(@"lastMonth=%@",lastMonth);Stack Overflow用户
发布于 2009-12-12 00:43:54
改编自Date and Time Programming Guide
// Right now, you can remove the seconds into the day if you want
NSDate *today = [NSDate date];
// All intervals taken from Google
NSDate *yesterday = [today dateByAddingTimeInterval: -86400.0];
NSDate *thisWeek = [today dateByAddingTimeInterval: -604800.0];
NSDate *lastWeek = [today dateByAddingTimeInterval: -1209600.0];
// To get the correct number of seconds in each month use NSCalendar
NSDate *thisMonth = [today dateByAddingTimeInterval: -2629743.83];
NSDate *lastMonth = [today dateByAddingTimeInterval: -5259487.66];如果您希望根据月份获得准确的天数，则应使用NSCalendar。
Stack Overflow用户
发布于 2010-06-22 17:55:12
NSDateComponents今天很好用：
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *date = [NSDate date];
NSDateComponents *comps = [cal components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
fromDate:date];
NSDate *today = [cal dateFromComponents:comps];这将创建一个仅包含年、月和日期的NSDate：
(gdb) po today
2010-06-22 00:00:00 +0200要得到昨天等等，你可以使用NSDateComponents计算它：
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:-1];
NSDate *yesterday = [cal dateByAddingComponents:components toDate:today options:0];页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/1889164
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