我有以下代码:
NSDate *今天 = [NSDate 日期]; NSDateFormatter *formatter = [[NSDateFormatter alloc]init]; NSLocale *zh_CN = [[NSLocale alloc]initWithLocaleIdentifier:@"zh_CN"]; [格式化setLocale:zh_CN]; [格式化程序 setDateStyle:NSDateFormatterFullStyle]; [格式化程序设置时间样式:NSDateFormatterNoStyle]; NSDateFormatter *newFormatter = [[NSDateFormatter alloc]init]; NSLocale *en_US = [[NSLocale alloc]initWithLocaleIdentifier:@"en_US"]; [newFormatter setLocale:en_US]; [newFormatter setDateStyle:NSDateFormatterFullStyle]; [newFormatter setTimeStyle:NSDateFormatterNoStyle]; NSLog(@"今天: %@", 今天); NSString *todayString = [格式化字符串从日期:今天]; NSLog(@"zh_CN todayString: %@", todayString); NSDate *backToDate = [格式化程序 dateFromString:todayString]; NSLog(@"zh_CN backToDate: %@", backToDate); NSString *newTodayString = [newFormatter stringFromDate:today]; NSLog(@"en_US newTodayString: %@", newTodayString); NSDate *newBackToDate = [newFormatter dateFromString:newTodayString]; NSLog(@"en_US newBackToDate: %@", newBackToDate);
我期待 backToDate = newBackToDate = 今天,但日志显示不同:
2013-02-15 00:18:12.594 TestNSDate[16637:11303] 今天:2013-02-14 16:18:12 +0000 2013-02-15 00:18:12.595 TestNSDate[16637:11303] zh_CN todayString: 2013 年 2 月 15 日星期五 2013-02-15 00:18:12.596 TestNSDate[16637:11303] zh_CN backToDate: 1999-12-30 16:00:00 +0000 2013-02-15 00:18:12.619 TestNSDate[16637:11303] en_US newTodayString:2013 年 2 月 15 日,星期五 2013-02-15 00:18:12.620 TestNSDate[16637:11303] en_US newBackToDate: 2013-02-14 16:00:00 +0000
这里我们可以看到backToDate变成了1999-12-30,为什么会这样呢?