如何计算两个位置之间的时间差 [英] How to calculate the time difference between two locations

问题描述

我在计算两个时区之间的时差时遇到问题。

I am having a problem with calculating time difference between two timeZones.

如果我在A位置，我知道纬度和经度以及当前时间。
我去位置BI知道纬度和经度和当前时间。

If I am at location A I know the latitude and longitude and the current time. I go to location B I know the latitude and longitude and the current time.

如何计算两个当前点之间的时间差.. ）

How to calculate the time difference between the two current points .. (in UTC)

推荐答案

首先得到一个数据库或库，转换lat / long得到国家和州/省。然后使用NSTimeZone类检索特定国家/地区的时区。您可以从许多网站购买此类数据库，即：
http://www.ip2location.com/

Firstly get a database or library that converts lat/long to get the country and state/province. Then use the NSTimeZone class to retrieve the timezone for a particular country. You can purchase such databases from many sites, ie: http://www.ip2location.com/

要进行实际的转换，您可以这样做：

To do the actual conversion you would do something like this:

NSTimeZone *sourceTimeZone =
    [NSTimeZone timeZoneWithAbbreviation: @"GMT"];
NSTimeZone *destinationTimeZone =
    [NSTimeZone timeZoneWithAbbreviation: @"EST"];

NSInteger sourceSeconds =
    [sourceTimeZone secondsFromGMTForDate:date];
NSInteger destinationSeconds =
    [destinationTimeZone secondsFromGMTForDate:date];
NSTimeInterval interval = destinationSeconds - sourceSeconds;

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