从UTC-5时区日期和时间iPhone应用程序获取当前iPhone设备时区的日期和时间？ [英] Get current iPhone device timezone date and time from UTC-5 timezone date and time iPhone app?

问题描述

在我的iPhone应用程序中，我很难将Web服务响应时间转换为当前设备时间。 UTC-5时区的 webservice时间。该应用程序是全球使用的应用所以我必须将响应时间转换为当前设备时区。这是一个简单的消息传递应用程序。

In my iPhone application i am very struggling to convert the webservice response time to current device time. The webservice time in UTC-5 timezone. The app is worldwide use app. So i have to convert the response time to current device timezone. This is simple messaging app.

当我发送消息时，时间是下午5:05（印度钦奈时区）但是当我从检索时间时，webservice是2012-07-16 07:33:01 。当我在应用程序中显示时间时，我应该将时间转换为设备的本地时间。我试过某种方式，但我还不能解决。代码是：

When i have sent a message the time is "5:05 PM" (India Chennai timezone) but when am retrieve time from webservice is "2012-07-16 07:33:01". When i show the time in the app i should convert the time to device's local time. I have tried in some way but i can't solve yet. Code is:

NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init]; 
[dateFormatter1 setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 
[dateFormatter1 setLocale:[NSLocale currentLocale]];
//[dateFormatter1 setTimeZone:[NSTimeZone timeZoneWithName:@"IST"]];
[dateFormatters setTimeZone:[NSTimeZone systemTimeZone]];
NSDate *date = [dateFormatter1 dateFromString:dateStr];
NSLog(@"date : %@",date);

但输出日期和时间 2012-07-16 02:03 ：01 +0000 我已将此日期/时间存储在 Coredata 中，当我从 CoreData 并使用以下代码转换为 NSString ，

But the output date and time is 2012-07-16 02:03:01 +0000 I have stored this date/time in Coredata and when I have retrieve from CoreData and covert to NSString using the below code,

NSDateFormatter *dateFormatters = [[NSDateFormatter alloc] init];
[dateFormatters setDateFormat:@"dd-MMM-yyyy hh:mm"];
[dateFormatters setDateStyle:NSDateFormatterShortStyle];
[dateFormatters setTimeStyle:NSDateFormatterShortStyle];
[dateFormatters setDoesRelativeDateFormatting:YES];
[dateFormatters setTimeZone:[NSTimeZone systemTimeZone]];  
dateStr = [dateFormatters stringFromDate:dateString];
NSLog(@"DateString : %@", dateStr);

输出日期和时间是今天上午7:33 。应该显示今天下午5:05 。有人可以保存我的一天吗？请帮忙解决这个问题。在此先感谢。

The output date and time is "Today 7:33 AM". It should be show "Today 5:05 PM". Can anyone please save my day? Please help to solve this issue. Thanks in advance.

推荐答案

我测试了您的方案并添加了一些代码供您参考。请测试以下内容，请告诉我这对您有用。

I have tested your scenario and added some code for your reference. Please test the below and please let me know it is useful for you.

NSString *dateStr = @"2012-07-16 07:33:01";
NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init]; 
[dateFormatter1 setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 
NSDate *date = [dateFormatter1 dateFromString:dateStr];
NSLog(@"date : %@",date);

NSTimeZone *currentTimeZone = [NSTimeZone localTimeZone];
NSTimeZone *utcTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];

NSInteger currentGMTOffset = [currentTimeZone secondsFromGMTForDate:date];
NSInteger gmtOffset = [utcTimeZone secondsFromGMTForDate:date];
NSTimeInterval gmtInterval = currentGMTOffset - gmtOffset;

NSDate *destinationDate = [[[NSDate alloc] initWithTimeInterval:gmtInterval sinceDate:date] autorelease];

NSDateFormatter *dateFormatters = [[NSDateFormatter alloc] init];
[dateFormatters setDateFormat:@"dd-MMM-yyyy hh:mm"];
[dateFormatters setDateStyle:NSDateFormatterShortStyle];
[dateFormatters setTimeStyle:NSDateFormatterShortStyle];
[dateFormatters setDoesRelativeDateFormatting:YES];
[dateFormatters setTimeZone:[NSTimeZone systemTimeZone]];  
dateStr = [dateFormatters stringFromDate: destinationDate];
NSLog(@"DateString : %@", dateStr);

谢谢。

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