如何從NSDate中獲取日組件？

3

注意，一個NSDate只是一個時間戳，並只有當相對於被認爲是「天」給定的日曆和時區。如果你想在當前時區公曆，

NSTimeZone * tz = [NSTimeZone localTimeZone]; 
CFAbsoluteTime at = CFDateGetAbsoluteTime((CFDateRef)date); 
int day = CFAbsoluteTimeGetGregorianDate(at, (CFTimeZoneRef)tz).day;

如果你想在UTC時間，設置tz = nil。

此外，CFAbsoluteTime和NSDate（據我所知）基於POSIX時間，它指定了86400秒的一天，因此不處理閏秒。

來源

2010-05-25 18:05:56

+0

最佳答案將針對當前時區。 – Dmitry 2013-04-19 11:58:36

+0

@Altaveron這不一定是真的。例如，在單元測試中，您希望指定明確的時區而不是訪問全局狀態。 – 2013-04-22 18:31:32

18

關於如何從NSDate獲取日曆組件，請考慮this post。本質上，它看起來像：

NSCalendar*  calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
NSDateComponents* components = [calendar components:NSDayCalendarUnit 
              fromDate:myDate]; 
NSInteger   day = [components day];

（不要忘記內存管理上面。）

來源

2010-05-25 17:56:04 fbrereto

+2

這是做到這一點的方法。不創建日期格式化程序和其他瘋狂。 – 2012-12-28 23:02:14

+1

這似乎是OP所要求的而非公認的答案。 – ohhh 2015-02-04 18:41:18

5

如果您只需要NSDate的「25」部分，您可以從dateFormatter中獲取它。

喜歡的東西：

NSDate *today = [NSDate date]; 
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
[dateFormatter setDateFormat:@"dd"]; 
NSString *dayInMonthStr = [dateFormatter stringFromDate:today]; 
int dayInMonth = [dayInMonthStr intValue]; 
[dateFormatter release]; 
NSLog(@"Today is the %i. day of the month", dayInMonth);

來源

2010-05-25 20:36:52 RickiG

2

使用「EEEE」作爲當天的全名格式。

使用「EEE」作爲當天短名稱的格式。

例子：

- (NSString *)getDayOfTheWeek:(NSDate *)date{ 
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init] ; 
    [dateFormatter setDateFormat:@"EEEE"]; 
    NSString *formattedDateString = [dateFormatter stringFromDate:date]; 
    return formattedDateString; 
    }

來源

2012-04-29 18:09:22

-1

我有這個問題而回，我創建了下面的方法來讓一切都更容易。

定義

#define DATE_TYPE_hhmmss [NSArray arrayWithObjects:@"h", @"m", @"s", nil] 
#define DATE_TYPE_MMDDYYYY [NSArray arrayWithObjects:@"M", @"D", @"Y", nil] 
#define DATE_TYPE_MMDDYYYYhhmmss [NSArray arrayWithObjects:@"M", @"D", @"Y", @"h", @"m", @"s", nil] 
#define DATE_TYPE_MMDDYYYYWWhhmmss [NSArray arrayWithObjects:@"M", @"D", @"Y", @"W", @"h", @"m", @"s", nil] 
#define DATE_TYPE_MMDDYYYYhhmmssWW [NSArray arrayWithObjects:@"M", @"D", @"Y", @"h", @"m", @"s", @"W", nil] 
#define DATE_TYPE_YYYYMMDD [NSArray arrayWithObjects:@"Y", @"M", @"D", nil] 
#define DATE_TYPE_YYYYMMDDhhmmss [NSArray arrayWithObjects:@"Y", @"M", @"D", @"h", @"m", @"s", nil] 
#define DATE_TYPE_YYYYMMDDWWhhmmss [NSArray arrayWithObjects:@"Y", @"M", @"D", @"W", @"h", @"m", @"s", nil] 
#define DATE_TYPE_YYYYMMDDhhmmssWW [NSArray arrayWithObjects:@"Y", @"M", @"D", @"h", @"m", @"s", @"W", nil] 
#define DATE_TYPE_FRIENDLY [NSArray arrayWithObjects:@"xx", nil]

日期方法

創建日期從價值觀

-(NSDate *) getDateWithMonth:(int)month day:(int)day year:(int)year { 
    NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
    NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; 
    NSDateComponents * dateComponents = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:[NSDate date]]; 

    [dateFormatter setDateFormat:@"MM"]; 
    [dateComponents setMonth:month]; 
    [dateFormatter setDateFormat:@"DD"]; 
    [dateComponents setDay:day]; 
    [dateFormatter setDateFormat:@"YYYY"]; 
    [dateComponents setYear:year]; 

    NSDate * result = [calendar dateFromComponents:dateComponents]; 

    return result; 
} 

-(NSDate *) getDateWithMonth:(int)month day:(int)day year:(int)year hour:(int)hour minute:(int)minute { 
    NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
    NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; 
    NSDateComponents * dateComponents = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:[NSDate date]]; 

    [dateFormatter setDateFormat:@"MM"]; 
    [dateComponents setMonth:month]; 
    [dateFormatter setDateFormat:@"DD"]; 
    [dateComponents setDay:day]; 
    [dateFormatter setDateFormat:@"YYYY"]; 
    [dateComponents setYear:year]; 
    [dateFormatter setDateFormat:@"HH"]; 
    [dateComponents setHour:hour]; 
    [dateFormatter setDateFormat:@"MM"]; 
    [dateComponents setMinute:minute]; 

    NSDate * result = [calendar dateFromComponents:dateComponents]; 

    return result; 
} 

-(NSDate *) getDateWithMonth:(int)month day:(int)day year:(int)year hour:(int)hour minute:(int)minute second:(int)second { 
    NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
    NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; 
    NSDateComponents * dateComponents = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:[NSDate date]]; 

    [dateFormatter setDateFormat:@"MM"]; 
    [dateComponents setMonth:month]; 
    [dateFormatter setDateFormat:@"DD"]; 
    [dateComponents setDay:day]; 
    [dateFormatter setDateFormat:@"YYYY"]; 
    [dateComponents setYear:year]; 
    [dateFormatter setDateFormat:@"HH"]; 
    [dateComponents setHour:hour]; 
    [dateFormatter setDateFormat:@"MM"]; 
    [dateComponents setMinute:minute]; 
    [dateFormatter setDateFormat:@"SS"]; 
    [dateComponents setSecond:second]; 

    NSDate * result = [calendar dateFromComponents:dateComponents]; 

    return result; 
}

獲取字符串從日期

-(NSString *) getStringFromDate:(NSDate *)date dateType:(NSArray *)dateType { 
    NSString * result = @""; 

    NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
    NSString * format = @""; 

    NSDateComponents * dateComponents = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit) fromDate:date]; 

    NSInteger year = [dateComponents year]; 
    NSInteger month = [dateComponents month]; 
    NSInteger day = [dateComponents day]; 
    NSInteger weekday = [dateComponents weekday]; 
    NSInteger hour = [dateComponents hour]; 
    NSInteger minute = [dateComponents minute]; 
    NSInteger second = [dateComponents second]; 

    if (dateType != nil) { 
     for (int x = 0; x < [dateType count]; x++) { 
      if (x == ([dateType count]-1)) { 
       if ([[dateType objectAtIndex:x] isEqualToString:@"Y"]) { 
        format = [format stringByAppendingFormat:@"%d", year]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"M"]) { 
        format = [format stringByAppendingFormat:@"%d", month]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"D"]) { 
        format = [format stringByAppendingFormat:@"%d", day]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"W"]) { 
        format = [format stringByAppendingFormat:@"%d", weekday]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"h"]) { 
        format = [format stringByAppendingFormat:@"%d", hour]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"m"]) { 
        format = [format stringByAppendingFormat:@"%d", minute]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"s"]) { 
        format = [format stringByAppendingFormat:@"%d", second]; 
       } 
      } else { 
       if ([[dateType objectAtIndex:x] isEqualToString:@"Y"]) { 
        format = [format stringByAppendingFormat:@"%d|", year]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"M"]) { 
        format = [format stringByAppendingFormat:@"%d|", month]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"D"]) { 
        format = [format stringByAppendingFormat:@"%d|", day]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"W"]) { 
        format = [format stringByAppendingFormat:@"%d|", weekday]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"h"]) { 
        format = [format stringByAppendingFormat:@"%d|", hour]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"m"]) { 
        format = [format stringByAppendingFormat:@"%d|", minute]; 
       } else if ([[dateType objectAtIndex:x] isEqualToString:@"s"]) { 
        format = [format stringByAppendingFormat:@"%d|", second]; 
       } 
      } 

      if ([[dateType objectAtIndex:x] isEqualToString:@"xx"]) { 
       format = [NSString stringWithFormat:@"Year: %d, Month: %d, Day: %d, Weekday: %d, Hour: %d, Minute: %d, Second: %d", year, month, day, weekday, hour, minute, second]; 
      } 
     } 
    } else { 
     format = [format stringByAppendingFormat:@"%d|", year]; 
     format = [format stringByAppendingFormat:@"%d|", month]; 
     format = [format stringByAppendingFormat:@"%d|", day]; 
     format = [format stringByAppendingFormat:@"%d|", weekday]; 
     format = [format stringByAppendingFormat:@"%d|", hour]; 
     format = [format stringByAppendingFormat:@"%d|", minute]; 
     format = [format stringByAppendingFormat:@"%d|", second]; 

     format = [NSString stringWithFormat:@"%d|%d|%d|%d|%d|%d|%d", year, month, day, weekday, hour, minute, second]; 
    } 

    result = format; 

    return result; 
}

例

NSDate * date = [self getDateWithMonth:12 day:24 year:1994]; 
NSString * dateInString = [self getStringFromDate:date dateType:DATE_TYPE_MMDDYYYY]; 

int month = [[[dateInString componentsSeparatedByString:@"|"] objectAtIndex:0] intValue]; 
int day = [[[dateInString componentsSeparatedByString:@"|"] objectAtIndex:1] intValue]; 
int year = [[[dateInString componentsSeparatedByString:@"|"] objectAtIndex:2] intValue]; 

NSLog(@"String of Date: \"%@\"", dateInString); 
NSLog(@"Month: %d", month); 
NSLog(@"Day: %d", day); 
NSLog(@"Year: %d", year);

[self getDateWithMonth:12 day:24 year:1994]返回一個NSDate對象通常是難以閱讀，因此，您可以使用[self getStringFromDate:date dateType:DATE_TYPE_MMDDYYYY]得到的字符串的方法一個NSDate對象。

使用定義（宏）來指定想要在字符串中獲取的日期的格式。

等等...

控制檯日誌

2012-04-29 13:42:15.791 Atomic Class[1373:f803] String of Date: "12|24|1994" 
2012-04-29 13:42:15.793 Atomic Class[1373:f803] Month: 12 
2012-04-29 13:42:15.794 Atomic Class[1373:f803] Day: 24 
2012-04-29 13:42:15.794 Atomic Class[1373:f803] Year: 1994

來源

2012-04-29 18:53:10

如何從NSDate中獲取日組件？

回答

相關問題