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.