如何将时间转换为iPhone设备的时区？ [英] How to convert time to the time zone of the iPhone device?

问题描述

我有一段时间在EST时区，它是使用NOW（）函数在mysql服务器上完成的。因为我的服务器位于EST，所以存储的时间是在EST。当我从iPhone上的应用程序中检索它时，我需要在用户正确的时区显示它。

解决方案

//您可以使用以下函数将日期转换为希望的时区

  +（NSDate *）convertDate：（NSDate *）date toTimeZone :( NSString *）timeZoneAbbreviation {
 
 NSTimeZone * systemZone = [NSTimeZone systemTimeZone]; 
 NSTimeZone * zoneUTC = [NSTimeZone timeZoneWithAbbreviation：timeZoneAbbreviation]; 
 NSTimeInterval s = [zoneUTC secondsFromGMT]; 
 
 NSTimeZone * myZone = [NSTimeZone timeZoneWithAbbreviation：[systemZone缩写ForDate：date]]; 
 NSTimeInterval p = [myZone secondsFromGMT]; 
 
 NSTimeInterval i = s-p; 
 NSDate * d = [NSDate dateWithTimeInterval：i sinceDate：date]; 
 
 return d; 
 
} 
 
 
 //测试用例**注意** cgUtil是这个方法的类，因此相应地更改它
 
 __block NSDate * now = [NSDate date]; 
 NSLog（@当前时间：％@，现在）; 
 [[NSTimeZone缩写词典] allKeys] enumerateObjectsUsingBlock：^（NSString * abb，NSUInteger idx，BOOL * stop）{
 NSLog（@Time zone abb：％@：Time：％@，abb ，[cgUtil convertDate：now toTimeZone：abb]）; 
}]; 
  

I have a time in EST timezone, it is done using the NOW() function on the mysql server. Because my server is located in EST, the time stored is in EST. When I retrieve it from my app on the iPhone, I need to display it in the correct time zone of the user. How do I do that?

解决方案

//You can use the below function to convert date to a time zone you wish

+ (NSDate *) convertDate:(NSDate *) date toTimeZone:(NSString *) timeZoneAbbreviation {

    NSTimeZone *systemZone  = [NSTimeZone systemTimeZone];
    NSTimeZone *zoneUTC     = [NSTimeZone timeZoneWithAbbreviation:timeZoneAbbreviation];
    NSTimeInterval s        = [zoneUTC secondsFromGMT];

    NSTimeZone *myZone      = [NSTimeZone timeZoneWithAbbreviation:[systemZone abbreviationForDate:date]];
    NSTimeInterval p        = [myZone secondsFromGMT];

    NSTimeInterval i = s-p;
    NSDate *d = [NSDate dateWithTimeInterval:i sinceDate:date];

    return d;

}


//Test case **note** cgUtil is the class this method is written thus change it accordingly

__block NSDate *now = [NSDate date];
NSLog(@"Current time:%@", now);
[[[NSTimeZone abbreviationDictionary] allKeys] enumerateObjectsUsingBlock:^(NSString * abb, NSUInteger idx, BOOL *stop) {
    NSLog(@"Time zone abb:%@:Time:%@",abb,[cgUtil convertDate:now toTimeZone:abb]);
}];

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