iOS 手机时区获取问题

 1. 标准的获取时区的正确方法

　 [NSTimeZone resetSystemTimeZone]; // 重置手机系统的时区

NSInteger offset = [NSTimeZone localTimeZone].secondsFromGMT;

offset = offset/3600;

NSString *tzStr = [NSString stringWithFormat:@"%ld", (long)offset];

　获取的时区:(Asia/Shanghai (GMT+8) offset 28800)

2.  截取 GMT 方法

//获取当地的时区

NSString *tzStr;

NSTimeZone *localTimeZone = [NSTimeZone localTimeZone];

NSArray *zoneArray = [[NSString stringWithFormat:@"%@", localTimeZone] componentsSeparatedByString:@"GMT"];

NSString *tempTZ = [NSString stringWithFormat:@"%@", zoneArray.lastObject];

// eg: +8 去掉"+", -8 传入全部, +0 / -0

// - 1 ~ 12, + 1 ~ +12, 0

if([tempTZ hasPrefix:@"+"]) {

tzStr = [NSString stringWithFormat:@"%c", [tempTZ characterAtIndex:1]];

}else  if([tempTZ hasPrefix:@"-"]){

tzStr = [NSString stringWithFormat:@"%@", [tempTZ substringToIndex:2]];

}else if([tempTZ hasPrefix:@"0"]) {

tzStr = [NSString stringWithFormat:@"%@", [tempTZ substringToIndex:1]];

}

获取的时区: Europe/Berlin (CEST) offset 7200 (Daylight)

鉴于有些时区非携带 GMT 格式吗故 "方法二 " 不可行, 采用 "方法一".

根据距离 0 时区偏差的秒数算出时区.