将日期从时区转换为设备本地时区和日期 [英] Convert date from timezone to device local timezone and date

问题描述

如何将 timezone1 的日期转换为设备本地 timezone2 的日期?

How can I convert date with timezone1 to date with device local timezone2?

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:@"Asia/Jerusalem"]];
NSDate *date = [dateFormat dateFromString:timestamp];

then something like:
[dateFormat2 setTimeZone:[NSTimeZone localTimeZone]];
date2 = [dateFormat2 dateFromDate:date withOtherTimeZone:zone];

更新:

我想我明白了.

//get source date from the server
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
NSDate *sourceDate = [dateFormat dateFromString:timestamp];

//set timezones
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithName:@"Asia/Jerusalem"];
NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];

//calc time difference
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;

//set current real date
NSDate* date = [[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate];

可以吗?

推荐答案

这就是答案:

NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithName:@"Asia/Jerusalem"];
NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];

//calc time difference
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;

//set current real date
NSDate* date = [[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate];

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