blocks|key|1169503|text|改编自Date+and+Time+Programming+Guide|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1169504|//+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];|code-block|syntax|javascript|1169505|如果您希望根据月份获得准确的天数，则应使用NSCalendar。|style|CODE|1169506|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/DatesAndTimes/Articles/dtDates.html|1|https://developer.apple.com/documentation/foundation/nscalendar?language=objc^0|3|V|0|0|0|L|A|L|A|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@$A|12|B|13|K|L]]|9|@$A|14|B|15|1|16]]|C|$]]|$1|M|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

Adapted from the <a href="https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/DatesAndTimes/Articles/dtDates.html" rel="noreferrer">Date and Time Programming Guide</a>:

<pre><code>// 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];
</code></pre>

If you want the correct exact number of days depending on the month, you should use an <a href="https://developer.apple.com/documentation/foundation/nscalendar?language=objc" rel="noreferrer"><code>NSCalendar</code></a>.

blocks|key|1384611|text|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|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1384612|NSCalendar+*cal+=+[NSCalendar+currentCalendar];
NSDateComponents+*components+=+[cal+components:(+NSCalendarUnitHour+%7C+NSCalendarUnitMinute+%7C+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+%7C+NSYearCalendarUnit+%7C+NSMonthCalendarUnit+%7C+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=%25@",today);
NSLog(@"yesterday=%25@",yesterday);
NSLog(@"thisWeek=%25@",thisWeek);
NSLog(@"lastWeek=%25@",lastWeek);
NSLog(@"thisMonth=%25@",thisMonth);
NSLog(@"lastMonth=%25@",lastMonth);|code-block|syntax|javascript|1384613|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Might be a better way to write this but here what i came up on Ben's NSCalendar suggestion and working from there to NSDateComponents

<pre><code>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);
</code></pre>

blocks|key|1384675|text|我非常喜欢这个项目中包含的THCalendarInfo对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1384676|http://github.com/jaredholdcroft/kcalendar|offset|length|1384677|我找不到原件。使用此对象，您可以移动到前一天，一周的开始，一个月的开始，获取一周的某一天，一个月的某一天……等等等等。|1384678|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|16|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I really like the THCalendarInfo object contained in this project:

<a href="http://github.com/jaredholdcroft/kcalendar" rel="nofollow noreferrer">http://github.com/jaredholdcroft/kcalendar</a>

I can't quite find the original. Using this object you can move to a previous day, the start of a week, the start of a month, get the day of a week, the day of a month... etc. etc.

blocks|key|1169618|text|NSDateComponents今天很好用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1169619|NSCalendar+*cal+=+[NSCalendar+currentCalendar];

NSDate+*date+=+[NSDate+date];
NSDateComponents+*comps+=+[cal+components:(NSYearCalendarUnit+%7C+NSMonthCalendarUnit+%7C+NSDayCalendarUnit)+
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++fromDate:date];
NSDate+*today+=+[cal+dateFromComponents:comps];|code-block|syntax|javascript|1169620|这将创建一个仅包含年、月和日期的NSDate：|1169621|(gdb)+po+today
2010-06-22+00:00:00+%2B0200|1169622|要得到昨天等等，你可以使用NSDateComponents计算它：|1169623|NSDateComponents+*components+=+[[NSDateComponents+alloc]+init];
[components+setDay:-1];
NSDate+*yesterday+=+[cal+dateByAddingComponents:components+toDate:today+options:0];|1169624|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

NSDateComponents is nice to get today:

<pre><code>NSCalendar *cal = [NSCalendar currentCalendar];

NSDate *date = [NSDate date];
NSDateComponents *comps = [cal components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) 
 fromDate:date];
NSDate *today = [cal dateFromComponents:comps];
</code></pre>

This creates a NSDate with only year, month and date:

<pre><code>(gdb) po today
2010-06-22 00:00:00 +0200
</code></pre>

To get yesterday, etc. you can calculate it using NSDateComponents:

<pre><code>NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:-1];
NSDate *yesterday = [cal dateByAddingComponents:components toDate:today options:0];
</code></pre>

blocks|key|1169642|text|NSDate+*today+=+[[NSDate+alloc]+initWithTimeIntervalSinceNow:0];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1169643|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSDate *today = [[NSDate alloc] initWithTimeIntervalSinceNow:0];
</code></pre>

blocks|key|1384751|text|%2B+(NSDate*)dateFor:(enum+DateType)dateType+{

++++NSCalendar+*calendar+=+[NSCalendar+currentCalendar];

++++NSDateComponents+*comps+=
++++[calendar+components:NSYearCalendarUnit+%7C+NSMonthCalendarUnit+%7C+NSDayCalendarUnit
++++++++++++++++fromDate:[NSDate+date]];

++++if(dateType+==+DateYesterday)+{

++++++++comps.day--;
++++}
++++else+if(dateType+==+DateThisWeek)+{

++++++++comps.weekday+=+1;
++++}
++++else+if(dateType+==+DateLastWeek)+{

++++++++comps.weekday+=+1;
++++++++comps.week--;
++++}
++++else+if(dateType+==+DateThisMonth)+{

++++++++comps.day+=+1;
++++}
++++else+if(dateType+==+DateLastMonth)+{

++++++++comps.day+=+1;
++++++++comps.month--;
++++}
++++else+if(dateType+!=+DateToday)
++++++++return+nil;

++++return+[calendar+dateFromComponents:comps];
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1384752|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>+ (NSDate*)dateFor:(enum DateType)dateType {

 NSCalendar *calendar = [NSCalendar currentCalendar];

 NSDateComponents *comps =
 [calendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
 fromDate:[NSDate date]];

 if(dateType == DateYesterday) {

 comps.day--;
 }
 else if(dateType == DateThisWeek) {

 comps.weekday = 1;
 }
 else if(dateType == DateLastWeek) {

 comps.weekday = 1;
 comps.week--;
 }
 else if(dateType == DateThisMonth) {

 comps.day = 1;
 }
 else if(dateType == DateLastMonth) {

 comps.day = 1;
 comps.month--;
 }
 else if(dateType != DateToday)
 return nil;

 return [calendar dateFromComponents:comps];
}
</code></pre>

blocks|key|1384768|text|NSDate+*today+=+[NSDate+date];+//+Today's+date
NSCalendar+*gregorian+=+[[NSCalendar+alloc]+initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents+*weekdayComponents+=[gregorian+componentsNSDayCalendarUnit+%7C+NSWeekdayCalendarUnit)+fromDate:today];
NSInteger+day+=+[weekdayComponents+day];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1384769|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>NSDate *today = [NSDate date]; // Today's date
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *weekdayComponents =[gregorian componentsNSDayCalendarUnit | NSWeekdayCalendarUnit) fromDate:today];
NSInteger day = [weekdayComponents day];
</code></pre>

blocks|key|1384804|text|其他的答案对我来说都不起作用(可能是因为我的时区)。我是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1384805|-+(BOOL)isOnThisWeek:(NSDate+*)dateToCompare
{
++++NSCalendar+*+calendar+=+[NSCalendar+currentCalendar];
++++NSDate+++++*+today++++=+[NSDate+date];

++++int+todaysWeek++++++++=+[[calendar+components:+NSWeekCalendarUnit+fromDate:today]+week];
++++int+dateToCompareWeek+=+[[calendar+components:+NSWeekCalendarUnit+fromDate:dateToCompare]+week];

++++int+todaysYear+++++++++=+[[calendar+components:NSYearCalendarUnit+fromDate:today]+year];
++++int+dateToCompareYear++=+[[calendar+components:NSYearCalendarUnit+fromDate:dateToCompare]+year];

++++if+(todaysWeek+==+dateToCompareWeek+&&+todaysYear+==+dateToCompareYear)+{
++++++++return+YES;
++++}

++++return+NO;
}|code-block|syntax|javascript|1384806|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The other answers just didn't work for me (maybe because of my time zone). This is how I do it:

<pre><code>- (BOOL)isOnThisWeek:(NSDate *)dateToCompare
{
 NSCalendar * calendar = [NSCalendar currentCalendar];
 NSDate * today = [NSDate date];

 int todaysWeek = [[calendar components: NSWeekCalendarUnit fromDate:today] week];
 int dateToCompareWeek = [[calendar components: NSWeekCalendarUnit fromDate:dateToCompare] week];

 int todaysYear = [[calendar components:NSYearCalendarUnit fromDate:today] year];
 int dateToCompareYear = [[calendar components:NSYearCalendarUnit fromDate:dateToCompare] year];

 if (todaysWeek == dateToCompareWeek &amp;&amp; todaysYear == dateToCompareYear) {
 return YES;
 }

 return NO;
}
</code></pre>

blocks|key|1384884|text|这是为了检查一下日期是不是这个月|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1384885|func+isOnThisMonth(dateToCompare:+NSDate)+->+Bool+{
++++let+calendar:+NSCalendar+=+NSCalendar.currentCalendar()
++++let+today:+NSDate+=+NSDate()
++++let+todaysWeek:+Int+=+calendar.components(NSCalendarUnit.Month,+fromDate:+today).month
++++let+dateToCompareWeek:+Int+=+calendar.components(.Month,+fromDate:+dateToCompare).month
++++let+todaysYear:+Int+=+calendar.components(NSCalendarUnit.Year,+fromDate:+today).year
++++let+dateToCompareYear:+Int+=+calendar.components(NSCalendarUnit.Year,+fromDate:+dateToCompare).year
++++if+todaysWeek+==+dateToCompareWeek+&&+todaysYear+==+dateToCompareYear+{
++++++++return+true
++++}
++++return+false
}|code-block|syntax|javascript|1384886|第二个仅将calendarUnit的类型更改为弱，如下所示|1384887|func+isOnThisWeek(dateToCompare:+NSDate)+->+Bool+{
++++let+calendar:+NSCalendar+=+NSCalendar.currentCalendar()
++++let+today:+NSDate+=+NSDate()
++++let+todaysWeek:+Int+=+calendar.components(NSCalendarUnit.Weekday,+fromDate:+today).weekday
++++let+dateToCompareWeek:+Int+=+calendar.components(.Weekday,+fromDate:+dateToCompare).weekday
++++let+todaysYear:+Int+=+calendar.components(NSCalendarUnit.Year,+fromDate:+today).year
++++let+dateToCompareYear:+Int+=+calendar.components(NSCalendarUnit.Year,+fromDate:+dateToCompare).year
++++if+todaysWeek+==+dateToCompareWeek+&&+todaysYear+==+dateToCompareYear+{
++++++++return+true
++++}
++++return+false
}|1384888|我希望这对某些人有帮助，谢谢。|1384889|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This is for check the date is this month or not 

<pre><code>func isOnThisMonth(dateToCompare: NSDate) -&gt; Bool {
 let calendar: NSCalendar = NSCalendar.currentCalendar()
 let today: NSDate = NSDate()
 let todaysWeek: Int = calendar.components(NSCalendarUnit.Month, fromDate: today).month
 let dateToCompareWeek: Int = calendar.components(.Month, fromDate: dateToCompare).month
 let todaysYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: today).year
 let dateToCompareYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: dateToCompare).year
 if todaysWeek == dateToCompareWeek &amp;&amp; todaysYear == dateToCompareYear {
 return true
 }
 return false
}
</code></pre>

And second one only change type of calendarUnit for weak like this 

<pre><code>func isOnThisWeek(dateToCompare: NSDate) -&gt; Bool {
 let calendar: NSCalendar = NSCalendar.currentCalendar()
 let today: NSDate = NSDate()
 let todaysWeek: Int = calendar.components(NSCalendarUnit.Weekday, fromDate: today).weekday
 let dateToCompareWeek: Int = calendar.components(.Weekday, fromDate: dateToCompare).weekday
 let todaysYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: today).year
 let dateToCompareYear: Int = calendar.components(NSCalendarUnit.Year, fromDate: dateToCompare).year
 if todaysWeek == dateToCompareWeek &amp;&amp; todaysYear == dateToCompareYear {
 return true
 }
 return false
}
</code></pre>

I hope this is helpful to someone Thanks.

I am trying to do is to get NSDate today, yesterday, this Week, last Week, this Month, last Month variables ready for comparison for headers to be added on UITableView's titleForHeaderInSection

What I want is done manually in the code below for date 2009-12-11

<pre><code> 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"];
</code></pre>

get NSDate today, yesterday, this Week, last Week, this Month, last Month... variables

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...

问今天，昨天，这周，上周，这个月，上个月，获取NSDate ...变量
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