blocks|key|1081944|text|NSDateFormatter+*dateFormatter+=+[[[NSDateFormatter+alloc]+init]+autorelease];++
[dateFormatter+setDateFormat:@"EEEE"];
NSLog(@"%25@",+[dateFormatter+stringFromDate:[NSDate+date]]);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1081945|根据当前区域设置，将当前星期几输出为区域设置中的字符串。|unstyled|1081946|要只获取星期几的数字，必须使用NSCalendar类：|1081947|NSCalendar+*gregorian+=+[[[NSCalendar+alloc]+initWithCalendarIdentifier:NSGregorianCalendar]+autorelease];
NSDateComponents+*comps+=+[gregorian+components:NSWeekdayCalendarUnit+fromDate:[NSDate+date]];
int+weekday+=+[comps+weekday];|1081948|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; 
[dateFormatter setDateFormat:@"EEEE"];
NSLog(@"%@", [dateFormatter stringFromDate:[NSDate date]]);
</code></pre>

outputs current day of week as a string in locale dependent on current regional settings.

To get just a week day number you must use NSCalendar class:

<pre><code>NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *comps = [gregorian components:NSWeekdayCalendarUnit fromDate:[NSDate date]];
int weekday = [comps weekday];
</code></pre>

blocks|key|1081997|text|只需使用以下三行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081998|CFAbsoluteTime+at+=+CFAbsoluteTimeGetCurrent();
CFTimeZoneRef+tz+=+CFTimeZoneCopySystem();
SInt32+WeekdayNumber+=+CFAbsoluteTimeGetDayOfWeek(at,+tz);|code-block|syntax|javascript|1081999|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|$]]

Just use these three lines:

<pre><code>CFAbsoluteTime at = CFAbsoluteTimeGetCurrent();
CFTimeZoneRef tz = CFTimeZoneCopySystem();
SInt32 WeekdayNumber = CFAbsoluteTimeGetDayOfWeek(at, tz);
</code></pre>

blocks|key|1082201|text|这里的许多答案都被弃用了。从iOS+8.4开始，它以字符串和数字的形式为您提供星期几。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1082202|NSDateFormatter+*dateFormatter+=+[[NSDateFormatter+alloc]+init];
[dateFormatter+setDateFormat:@"EEEE"];
NSLog(@"The+day+of+the+week:+%25@",+[dateFormatter+stringFromDate:[NSDate+date]]);

NSCalendar+*gregorian+=+[[NSCalendar+alloc]+initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents+*comps+=+[gregorian+components:NSCalendarUnitWeekday+fromDate:[NSDate+date]];
int+weekday+=+[comps+weekday];
NSLog(@"The+week+day+number:+%25d",+weekday);|code-block|syntax|javascript|1082203|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|$]]

Many of the answers here are deprecated. This works as of iOS 8.4 and gives you the day of the week as a string and as a number.

<pre><code>NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"EEEE"];
NSLog(@"The day of the week: %@", [dateFormatter stringFromDate:[NSDate date]]);

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = [gregorian components:NSCalendarUnitWeekday fromDate:[NSDate date]];
int weekday = [comps weekday];
NSLog(@"The week day number: %d", weekday);
</code></pre>

blocks|key|867710|text|下面是你在Swift+3中如何做到这一点，并获得一个本地化的日期名称…|type|unstyled|depth|inlineStyleRanges|entityRanges|data|867711|let+dayNumber+=+Calendar.current.component(.weekday,+from:+Date())+//+1+-+7
let+dayName+=+DateFormatter().weekdaySymbols[dayNumber+-+1]|code-block|syntax|javascript|867712|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|$]]

Here's how you do it in Swift 3, and get a localised day name…

<pre><code>let dayNumber = Calendar.current.component(.weekday, from: Date()) // 1 - 7
let dayName = DateFormatter().weekdaySymbols[dayNumber - 1]
</code></pre>

blocks|key|1082005|text|-(void)getdate+{
++++NSDateFormatter+*dateFormat+=+[[NSDateFormatter+alloc]+init];
++++[dateFormat+setDateFormat:@"yyyy-MM-dd"];
++++NSDateFormatter+*format+=+[[NSDateFormatter+alloc]+init];
++++[format+setDateFormat:@"MMM+dd,+yyyy+HH:mm"];
++++NSDateFormatter+*timeFormat+=+[[NSDateFormatter+alloc]+init];
++++[timeFormat+setDateFormat:@"HH:mm:ss"];
++++NSDateFormatter+*dateFormatter+=+[[NSDateFormatter+alloc]+init]+;
++++[dateFormatter+setDateFormat:@"EEEE"];

++++NSDate+*now+=+[[NSDate+alloc]+init];
++++NSString+*dateString+=+[format+stringFromDate:now];
++++NSString+*theDate+=+[dateFormat+stringFromDate:now];
++++NSString+*theTime+=+[timeFormat+stringFromDate:now];

++++NSString+*week+=+[dateFormatter+stringFromDate:now];
++++NSLog(@"\n"
++++++++++"theDate:+%7C%25@%7C+\n"
++++++++++"theTime:+%7C%25@%7C+\n"
++++++++++"Now:+%7C%25@%7C+\n"
++++++++++"Week:+%7C%25@%7C+\n"
+++++++++,+theDate,+theTime,dateString,week);+
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1082006|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>-(void)getdate {
 NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
 [dateFormat setDateFormat:@"yyyy-MM-dd"];
 NSDateFormatter *format = [[NSDateFormatter alloc] init];
 [format setDateFormat:@"MMM dd, yyyy HH:mm"];
 NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
 [timeFormat setDateFormat:@"HH:mm:ss"];
 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init] ;
 [dateFormatter setDateFormat:@"EEEE"];

 NSDate *now = [[NSDate alloc] init];
 NSString *dateString = [format stringFromDate:now];
 NSString *theDate = [dateFormat stringFromDate:now];
 NSString *theTime = [timeFormat stringFromDate:now];

 NSString *week = [dateFormatter stringFromDate:now];
 NSLog(@"\n"
 "theDate: |%@| \n"
 "theTime: |%@| \n"
 "Now: |%@| \n"
 "Week: |%@| \n"
 , theDate, theTime,dateString,week); 
}
</code></pre>

blocks|key|867391|text|我需要一个简单的(公历)星期几索引，其中0=Sunday和6=Saturday将用于模式匹配算法。在此基础上，只需使用索引从数组中查找日期名称即可。下面是我想出的不需要日期格式化程序、NSCalendar或date组件操作的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|867392|%2B(long)dayOfWeek:(NSDate+*)anyDate+{
++++//calculate+number+of+days+since+reference+date+jan+1,+01
++++NSTimeInterval+utcoffset+=+[[NSTimeZone+localTimeZone]+secondsFromGMT];
++++NSTimeInterval+interval+=+([anyDate+timeIntervalSinceReferenceDate]%2Butcoffset)/(60.0*60.0*24.0);
++++//mod+7+the+number+of+days+to+identify+day+index
++++long+dayix=((long)interval%2B8)+%25+7;
++++return+dayix;
}|code-block|syntax|javascript|867393|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|$]]

I needed a simple (Gregorian) day of the week index, where 0=Sunday and 6=Saturday to be used in pattern match algorithms. From there it is a simple matter of looking up the day name from an array using the index. Here is what I came up with that doesn't require date formatters, or NSCalendar or date component manipulation:

<pre><code>+(long)dayOfWeek:(NSDate *)anyDate {
 //calculate number of days since reference date jan 1, 01
 NSTimeInterval utcoffset = [[NSTimeZone localTimeZone] secondsFromGMT];
 NSTimeInterval interval = ([anyDate timeIntervalSinceReferenceDate]+utcoffset)/(60.0*60.0*24.0);
 //mod 7 the number of days to identify day index
 long dayix=((long)interval+8) % 7;
 return dayix;
}
</code></pre>

blocks|key|1082044|text|Vladimir的回答对我来说效果很好，但我想我应该发布日期格式字符串的Unicode链接。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1082045|http://www.unicode.org/reports/tr35/tr35-25.html#Date_Format_Patterns|offset|length|1082046|此链接用于Code6。iOS的其他版本有不同的标准，可以在X-+iOS文档中找到这些标准。|1082047|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1X|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]]]]

Vladimir's answer worked well for me, but I thought that I would post the Unicode link for the date format strings. 

<a href="http://www.unicode.org/reports/tr35/tr35-25.html#Date_Format_Patterns" rel="nofollow">http://www.unicode.org/reports/tr35/tr35-25.html#Date_Format_Patterns</a>

This link is for iOS 6. The other versions of iOS have different standards which can be found in the X-Code documentation.

blocks|key|1082132|text|它在Swift中是这样工作的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1082133|++++let+calendar+=+NSCalendar.currentCalendar()
++++let+weekday+=+calendar.component(.CalendarUnitWeekday,+fromDate:+NSDate())|code-block|syntax|javascript|1082134|然后将工作日分配给结果数字。|1082135|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This way it works in Swift: 

<pre><code> let calendar = NSCalendar.currentCalendar()
 let weekday = calendar.component(.CalendarUnitWeekday, fromDate: NSDate())
</code></pre>

Then assign the weekdays to the resulting numbers.

blocks|key|1082166|text|我有一个相当奇怪的问题，一周中的某一天。仅设置firstWeekday是不够的。设置时区也是必要的。我的工作解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1082167|+NSCalendar*+cal+=+[NSCalendar+currentCalendar];
+[cal+setTimeZone:[NSTimeZone+timeZoneForSecondsFromGMT:0]];
+[cal+setFirstWeekday:1];+//Sunday
+NSDateComponents*+comp+=+[cal+components:(+NSWeekOfMonthCalendarUnit+%7C+NSYearCalendarUnit+%7C+NSMonthCalendarUnit+%7C+NSDayCalendarUnit+%7C+NSWeekdayCalendarUnit+%7C+NSWeekCalendarUnit)++fromDate:date];
+return+[comp+weekday]++;|code-block|syntax|javascript|1082168|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|$]]

I had quite strange issue with getting a day of week. Only setting firstWeekday wasn't enough. It was also necesarry to set the time zone. My working solution was:

<pre><code> NSCalendar* cal = [NSCalendar currentCalendar];
 [cal setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
 [cal setFirstWeekday:1]; //Sunday
 NSDateComponents* comp = [cal components:( NSWeekOfMonthCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | NSWeekCalendarUnit) fromDate:date];
 return [comp weekday] ;
</code></pre>

blocks|key|1082242|text|Swift+2:将一周中的某一天排成一行。(based+on+neoscribe+answer)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1082243|let+dayOfWeek++=+Int((myDate.timeIntervalSinceReferenceDate+/+(60.0*60.0*24.0))+%25+7)
let+isMonday+++=+(dayOfWeek+==+0)
let+isSunday+++=+(dayOfWeek+==+6)|code-block|syntax|javascript|1082244|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/24750821/5839796^0|M|P|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Swift 2: Get day of week in one line. (<a href="https://stackoverflow.com/a/24750821/5839796">based on neoscribe answer</a>)

<pre><code>let dayOfWeek = Int((myDate.timeIntervalSinceReferenceDate / (60.0*60.0*24.0)) % 7)
let isMonday = (dayOfWeek == 0)
let isSunday = (dayOfWeek == 6)
</code></pre>

How do I get the day of the week as a string?

How do I get the day of the week with Foundation?

Swift

如何将星期几作为字符串获取？

问如何使用Foundation获取一周中的某天？
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问如何使用Foundation获取一周中的某天？
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