NSDateFormatter麻烦？

我试图parsing一个RSS提要，但date很难parsing。 datestring是： publishedDate = "2013-01-08T20:09:02.000Z"

这是我的代码：

 NSDateFormatter *utc = [[NSDateFormatter alloc] init]; [utc setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]]; [utc setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"]; NSDate *dtUTC = [utc dateFromString: publishedDate]; NSDateFormatter *dfLocal = [[NSDateFormatter alloc] init]; [dfLocal setDateFormat:@"yyyy-MM-dd"]; [dfLocal setTimeZone:[NSTimeZone localTimeZone]]; NSString *time =[dfLocal stringFromDate:dtUTC]; NSLog(@"original UTC %@ now local: %@", dtUTC, time); 

为什么date返回零？ 此外，我试图将UTC时间转换为CST时间。

Answer 1

使用

  [utc setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.'000Z'"]; 

Answer 2

只需将您的时区名称更改为CST并更改setDateFormat，如下所示：

 NSDateFormatter *cst = [[NSDateFormatter alloc] init]; [cst setTimeZone:[NSTimeZone timeZoneWithName:@"CST"]]; [cst setDateFormat:@"yyyy-mm-dd'T'HH:mm:ss.'000Z'"]; NSDate *theCST = [cst dateFromString:publishedDate]; NSLog(@"theCST is %@", theCST); 

Answer 3

包含毫秒的stime使用“S”。

 [utc setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'.'SSS'Z'"]; NSString *publishedDate = @"2013-01-08T20:09:02.000Z"; NSDateFormatter *utc = [[NSDateFormatter alloc] init]; [utc setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]]; [utc setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'.'SSS'Z'"]; NSDate *dtUTC = [utc dateFromString: publishedDate]; NSLog(@"dtUTC: %@", dtUTC); 

NSLog输出：
dtUTC：2013-01-08 20:09:02 +0000

 SDateFormatter *dfLocal = [[NSDateFormatter alloc] init]; [dfLocal setDateFormat:@"yyyy-MM-dd"]; [dfLocal setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]]; NSString *time =[dfLocal stringFromDate:dtUTC]; NSLog(@"original UTC %@ now local: %@", dtUTC, time); 

NSLog输出：
原始UTC 2013-02-08 20:09:02 +0000现在地方：2013-02-08