我想在iOS中转换NSString为NSDateObject,但我没有得到NSDate对象.当我通过字符串时,我的日期为零
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd MMM,yyyy HH:mm:ss"];
NSString *dateString = @"2013-10-23 04:04:05";
NSDate *date = [dateFormatter dateFromString: dateString];
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我做错了什么?