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

我在 EST 时区有一个时间，它是使用 mysql 服务器上的 NOW() 函数完成的.因为我的服务器在EST，所以存储的时间是在EST.当我从 iPhone 上的应用程序检索它时，我需要在用户的正确时区中显示它.我该怎么做?

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?

推荐答案

//您可以使用以下函数将日期转换为您希望的时区

//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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