从 NSTimeZone 以 "GMT 5:30" NSString 格式获取系统时区

Question

我对 objective C 有点陌生。我正在尝试以字符串格式获取系统时区。我的字符串中只需要“GMT 5:30”。

_devTimezone = (NSString*)[NSTimeZone systemTimeZone];

Answer 1

您可以将日期描述作为字符串，然后将所需的子字符串作为

NSString *myDate = [[NSDate date] descriptionWithLocale:[NSLocale systemLocale]];
myDate=[myDate substringWithRange:NSMakeRange(26, 9)];
NSLog(@"%@",myDate);

你会在日志中得到 GMT+05:30。

****已编辑****

如果你不确定什么是索引您可以设置日期格式，然后访问索引

NSString *dateStr = @"Wed, 14 Oct 2015 12:53:58 +0000";

 // Convert string to date object
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"EE, d LLLL yyyy HH:mm:ss Z"];
NSDate *date = [dateFormat dateFromString:dateStr];
NSString *myDate = [date descriptionWithLocale:[NSLocale systemLocale]];
myDate=[myDate substringWithRange:NSMakeRange(26, 9)]; 
NSLog(@"%@",myDate);

快乐编码..:)

Answer 2

您可以使用 NSTimeZone 方法 secondsFromGMT 获取偏移量作为 NSInteger 值，然后使用 NSString 方法 stringWithFormat 和将整数值分为小时和分钟的基本算法。

示例代码：

- (NSString *) getTimeZoneOffset:(NSTimeZone *)timezone
{
   NSInteger minutesFromGMT = timezone.secondsFromGMT / 60; 

   // handle negative offsets
   char sign;
   if (minutesFromGMT < 0)
   {
      sign = '-';
      minutesFromGMT = -minutesFromGMT; // make positive
   }
   else
      sign = '+';

   // split in hours and minutes
   NSInteger hoursFromGMT = minutesFromGMT / 60;
   minutesFromGMT %= 60;

   // format as string - making sure minutes is two digits with leading zero if needed
   // cast to int is OK as no value will be greater than 59!
   return [NSString stringWithFormat:@"GMT%c%d:%02d", sign, (int)hoursFromGMT, (int)minutesFromGMT];
}

HTH

Answer 3

这样做。

NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// display in 12HR/24HR (i.e. 11:25PM or 23:25) format according to User Settings
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];

//set timezone to GMT 5:30.
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];

NSString *currentTime = [dateFormatter stringFromDate:currentDate];
NSLog(@"User's current time %@",currentTime);

希望对你有帮助。

从 NSTimeZone 以 "GMT 5:30" NSString 格式获取系统时区

Get system time zone from NSTimeZone in "GMT 5:30" NSString format

objective-c

nsstring

nstimezone