Ios NSDate组件中的NSDate问题

我有一个类似于

2013-03-05T07:37:26.853的字符串，我想得到
输出：2013-03-05 07:37:26
。我希望在
NSDate
对象中获得最终输出。我使用下面的函数来转换期望输出。而且回来的时间不对

-  (NSDate *) getDateFromCustomString:(NSString *) dateStr 
{    NSArray *dateStrParts = [dateStr componentsSeparatedByString:@"T"];
    NSString *datePart = [dateStrParts objectAtIndex:0];
    NSString *timePart = [dateStrParts objectAtIndex:1];
    NSArray *dateParts = [datePart componentsSeparatedByString:@"-"];
    NSArray *timeParts = [timePart componentsSeparatedByString:@":"];

NSDateComponents *components = [[NSDateComponents alloc] init];

[components setHour:[[timeParts objectAtIndex:0] intValue]];
[components setMinute:[[timeParts objectAtIndex:1] intValue]];
[components setSecond:[[timeParts objectAtIndex:2] intValue]];

[components setYear:[[dateParts objectAtIndex:0] intValue]];
[components setMonth:[[dateParts objectAtIndex:1] intValue]];
[components setDay:[[dateParts objectAtIndex:2] intValue]];


NSCalendar *currentCalendar = [NSCalendar currentCalendar];  
NSDate *date = [currentCalendar dateFromComponents:components];
NSLog(@"Date 1:%@",date); // Returns wrong time (2013-03-05 02:07:26)

/* i had tried the below.
NSDateFormatter * format = [[NSDateFormatter alloc] init];
[format setTimeZone:NSTimeZoneNameStyleStandard];
[format setDateFormat:@"yyyy-MM-dd hh:mm:ss"];

NSLog(@"Date 2:%@",[format stringFromDate:date]); // Returns correct date (2013-03-05 07:37:26)

NSDate *fDate = [format dateFromString:[format stringFromDate:date]];
DLog(@"Date 3:%@",fDate); // Returns wrong time (2013-03-05 02:07:26)
*/

[components release];
return  date;
}

如果有任何想法，请告诉我
 你在这里看到的是一个时区问题。如果要记录正确的日期，我们需要为输入字符串提供一个GMT时区：

将此添加到代码中，看看会发生什么：

[components setTimeZone: [NSTimeZone timeZoneForSecondsFromGMT: 0]];

试试这个

    NSString *departTimeDate = @"2013-03-05T07:37:26.853";

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS"];

    NSDate *date = [dateFormatter dateFromString:departTimeDate];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSLog(@"Expected Result___ %@",[dateFormatter stringFromDate:date]); //2013-03-05 07:37:26

试试这个：问题是时区

+ (NSDate *) getDate:(NSString *) dateStr
{
    NSArray *dateStrParts = [dateStr componentsSeparatedByString:@"T"];
    NSString *datePart = [dateStrParts objectAtIndex:0];
    NSString *timePart = [dateStrParts objectAtIndex:1];

    NSString *t = [[timePart componentsSeparatedByString:@"."] objectAtIndex:0];
    NSString *newDateStr = [NSString stringWithFormat:@"%@ %@",datePart,t];
    //2013-03-05 07:37:26

    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    [df setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    [df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *date = [df dateFromString:newDateStr];
    DLog(@"%@",date);

    return  date;
}

-（NSDate*）getDateFromCustomString:（NSString*）dateStr{//输出：2013-03-05 07:37:26.NSArray*dateStrParts=[dateStr组件由字符串分隔：@“T0”]；NSString*datePart1=[dateStrParts对象索引：0]；NSString*timePart=[dateStrParts对象索引：1]；NSArray*datepart2=[timePart componentsSeparatedByString:@.”；NSString*date1=datePart1；NSString*date2=[datepart2 objectAtIndex:0]；NSLog（@“%@%”，date1，date2）；}
NSDate
对象的NSLog始终以GMT显示日期。如果考虑到您的时区，日期/时间是否正确？为什么要去掉小数秒？只需将“.SSS”添加到第一个日期格式。感谢您提醒我，NSLog仅以GMT输出，@rmaddy