iOS：将UTC时区转换为设备本地时区 [英] iOS: convert UTC timezone to device local timezone

问题描述

我正在尝试将以下时区转换为设备本地时区：

I am trying to convert the following timezone to device local timezone:

2013-08-03T05:38:39.590Z

请告诉我如何将其转换为当地时区。

Please let me know how to convert it to local timezone.

我该怎么做？

推荐答案

时区可以应用于NSDateFormatter ，您可以根据时差生成NSDate变量。

Time zones can be applied to NSDateFormatter, from which you can generate NSDate variables differentiated by the time difference.

NSString* input = @"2013-08-03T05:38:39.590Z";
NSString* format = @"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

// Set up an NSDateFormatter for UTC time zone
NSDateFormatter* formatterUtc = [[NSDateFormatter alloc] init];
[formatterUtc setDateFormat:format];
[formatterUtc setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

// Cast the input string to NSDate
NSDate* utcDate = [formatterUtc dateFromString:input];

// Set up an NSDateFormatter for the device's local time zone
NSDateFormatter* formatterLocal = [[NSDateFormatter alloc] init];
[formatterLocal setDateFormat:format];
[formatterLocal setTimeZone:[NSTimeZone localTimeZone]];

// Create local NSDate with time zone difference
NSDate* localDate = [formatterUtc dateFromString:[formatterLocal stringFromDate:utcDate]];

NSLog(@"utc:   %@", utcDate);
NSLog(@"local: %@", localDate);

[formatterUtc release];
[formatterLocal release];

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