我的本地和默认时区是 GMT +5,但是当我通过 NSDate 获取日期和时间时,它会返回 GMT 日期和时间。
例如,在设备上测试时我的代码和输出为,[设备时区伊斯兰堡 GMT +5]
NSTimeZone *lo = [NSTimeZone localTimeZone];
NSLog(@" - current local timezone is %@",lo); // GMT +5
2010-12-28 20:56:11.785 Done[484:307] - current local timezone is Local Time Zone (Asia/Karachi (GMT+05:00) offset 18000)
NSTimeZone *df = [NSTimeZone defaultTimeZone];
NSLog(@" - current default timezone is %@",df); // GMT +5
2010-12-28 20:56:11.790 Done[484:307] - current default timezone is Asia/Karachi (GMT+05:00) offset 18000
but
NSDate *cDate = [NSDate date];
NSLog(@"current date by NSDate %@",cDate); //but NSDate show GMT
2010-12-28 20:56:11.794 Done[484:307] current date by NSDate 2010-12-28 15:56:11 GMT
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy-MM-dd'T'HH:mm";
//// NSTimeZone *gmt = [NSTimeZone ]
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT+05:00"];
[dateFormatter setTimeZone:gmt];
NSString *timeStamp = [dateFormatter stringFromDate:[NSDate date]];
NSLog(@" date string object %@" ,timeStamp); // string From Date is GMT +5
2010-12-28 20:56:11.802 Done[484:307] date string object 2010-12-28T20:56
NSDate *datef = [dateFormatter dateFromString:timeStamp];
NSLog(@" date object %@" ,datef); // the date form above string gives again GMT
2010-12-28 20:56:11.809 Done[484:307] **date object 2010-12-28 15:56:00 GMT**
为什么 NSDate 不给出本地当前时间?请帮忙...
尝试这个...
NSDate* sourceDate = [NSDate date];
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;
NSDate* destinationDate = [[[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate] autorelease];
这有助于响应当前系统时区。
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