NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc] init]autorelease];

[dateFormatter setAMSymbol:@"AM"];

[dateFormatter setPMSymbol:@"PM"];

[dateFormatter setDateFormat:@"dd/MM/yyyy hh:mmaaa"];

NSDate *date = [NSDate date];

NSString * s = [dateFormatter stringFromDate:date];

显示效果为：10/05/2010 03:49PM

 

下面附上几个格式：这个是从Cocoachina上来的。呵呵。

yyyy:MM:dd G 'at' HH:mm:ss zzz            1996.07.10 AD at 15:08:56 PDT

EEE, MMM d, "yy                                         Wed,july 10, '99

h:mm a                                                     12:08 PM

hh 'o"clock' a,zzzz                                      12 o'clock PM, Pacific Daylight Time

K:mm a, z                                                 0:00 PM, PST

yyyyy,MMMM.dd GGG hh:mm aaa                01996.july.10 AD 12:08 PM

 

 

下面是得到当前的年，月，日，时，分，秒。

NSDate *date = [NSDate date];

 

NSCalendar *cal = [NSCalendar currentCalendar];

 

unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

 

NSDateComponents *dd = [cal components:unitFlags fromDate:date]; 

 

int y = [dd year];

 

int m = [dd month];

 

int d = [dd day];

 

int h = [dd hour];

 

int min = [dd minute];

 

int s = [dd second];

 

 例如：

    NSString *startData =   @"1374249600";

    //NSString *startData = @"1374249600000";

    NSTimeInterval nsTimeInterval = [startData integerValue];

    NSDate *date = [[NSDate alloc] initWithTimeIntervalSince1970:nsTimeInterval];

    NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];

    NSTimeZone* timeZone = [NSTimeZone localTimeZone];

    NSLog(@"localTimeZone is %@",timeZone);

    

    [dateFormatter setTimeZone:timeZone];

    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];

    [dateFormatter setTimeStyle:NSDateFormatterShortStyle];

    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];

    NSString *s = [dateFormatter stringFromDate:date];

    NSLog(@"+++++++s:%@" ,s);

 

输出结果：

localTimeZone is Local Time Zone (Asia/Shanghai (CST (China)) offset 28800)

+++++++s:2013-07-20 00:00:00.000

 

//将日期字符串类型转化成日期类型

NSDateFormatter *dateF = [[NSDateFormatter alloc] init];

[dateF setDateStyle:NSDateFormatterFullStyle]; //this format will be according to your own.

NSDate *todayDate = [dateF dateFromString: @"5-MAY-2011 00:00:00 +0000"];//please note, this date format must match the NSDateFormatter Style, or else return null.

NSTimeInterval inter = [todayDate timeIntervalSince1970]; //return as double