例1、  从服务器段获取到的字符串转化为时间如：转化1416882712000

//网络请求获取的数据

   NSString *time = [NSStringstringWithFormat:@"%@",[[dateListobjectAtIndex:indexPath.row]gradeDate]];

   NSInteger num = [time integerValue]/1000;（重点）

   NSDateFormatter *formatter = [[[NSDateFormatteralloc]init]autorelease];

   [formatter setDateStyle:NSDateFormatterMediumStyle];

   [formatter setTimeStyle:NSDateFormatterShortStyle];

   [formatter setDateFormat:@"YYYY-MM-dd"];

   NSDate*confromTimesp = [NSDatedateWithTimeIntervalSince1970:num];NSString*confromTimespStr =      [formatterstringFromDate:confromTimesp];

   cell.DateContent.text = confromTimespStr;

转化之后结果为：2014-11-25

例2、如何如何将一个字符串如“ 20110826134106”装化为任意的日期时间格式，下面列举两种类型：

   NSString*string = @"20110826134106";

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

    [inputFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"] autorelease]];

    [inputFormatter setDateFormat:@"yyyyMMddHHmmss"];

    NSDate*inputDate = [inputFormatter dateFromString:string];

    NSLog(@"date= %@", inputDate);

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

    [outputFormatter setLocale:[NSLocale currentLocale]];

    [outputFormatter setDateFormat:@"yyyy年MM月dd日 HH时mm分ss秒"];

    NSString *str= [outputFormatter stringFromDate:inputDate];

    NSLog(@"testDate:%@",str);

两次打印的结果为：

date= 2011-08-26 05:41:06 +0000

testDate:2011年08月26日 13时41分06秒

其他时间转化的网址收集：

http://longquan.iteye.com/blog/1873268

http://blog.csdn.net/l_ch_g/article/details/8217725

http://www.open-open.com/lib/view/open1374292431912.html

iOS中日期和字符串的相互转化(特殊)