NSDateFormatter 使用 stringWithDate 中的字符串输出错误: [英] NSDateFormatter wrong output with string from stringWithDate:
问题描述
为什么 NSDateFormatter 会误解他自己创建的 dateString?
Why does NSDateFormatter misinterpretes his own created dateString?
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"YYYY-MM-DD'T'HH:mm:ss.SSSZZZZ"];
NSDate *now = [NSDate date];
NSLog(@"Now: %@, Date: %@", [dateFormatter dateFromString:[dateFormatter stringFromDate:now]], now);
产生以下结果:现在:1970-01-06 18:07:05 +0100,日期:2010-01-06 18:07:05 +0100
produces the following result: Now: 1970-01-06 18:07:05 +0100, Date: 2010-01-06 18:07:05 +0100
我知道您应该使用 yyyy 和 dd(而 yyyy 和 dd 不会发生这种情况),但这不是重点.我希望在解析格式化程序为我创建的字符串时收到相同的日期.
I know that you should use yyyy and dd (and it does not happen with yyyy and dd), but that's not the point here. I am expecting to receive the same date when parsing the string the formatter has created for me.
推荐答案
这行得通
[dateFormatter setDateFormat:@"y-MM-DD'T'HH:mm:ss.SSSZZZZ"];
看这里,http://www.crystalminds.nl/?p=4 有关不同标志的更多信息.
Look here, http://www.crystalminds.nl/?p=4 for more info about the difrent flags.
使用 YYYY 时,格式化程序似乎无法识别任何年份,因为
It seems like the formatter doesn't recognize any year when using YYYY because
[dateFormatter setDateFormat:@"YYYY-MM-DD'T'HH:mm:ss.SSSZZZZ"];
// is equal to
[dateFormatter setDateFormat:@"MM-DD'T'HH:mm:ss.SSSZZZZ"];
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