iOs中的JSON日期字符串转换问题
我从WCF Rest服务获得一些UTC日期字符串,以下是格式:iOs中的JSON日期字符串转换问题,ios,json,nsdate,nsdateformatter,Ios,Json,Nsdate,Nsdateformatter,我从WCF Rest服务获得一些UTC日期字符串,以下是格式: /Date(1354851639500+0530)/ 我使用以下代码转换日期: //jsonDateString = 1354851639500+0530 NSInteger offset = [[NSTimeZone defaultTimeZone] secondsFromGMT]; //get number of seconds to add or subtract according to the client defau
/Date(1354851639500+0530)/
我使用以下代码转换日期:
//jsonDateString = 1354851639500+0530
NSInteger offset = [[NSTimeZone defaultTimeZone] secondsFromGMT]; //get number of seconds to add or subtract according to the client default time zone
NSTimeInterval unixTime = [[jsonDateString substringWithRange:NSMakeRange(0, 13)] doubleValue] / 1000; //WCF will send 13 digit-long value for the time interval since 1970 (millisecond precision) whereas iOS works with 10 digit-long values (second precision), hence the divide by 1000
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
[dateFormatter setTimeZone:timeZone];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a ZZZZ"];
NSString *stringFromDAte = [dateFormatter stringFromDate:[[NSDate dateWithTimeIntervalSince1970:unixTime] dateByAddingTimeInterval:offset]];
NSLog(@"Server GMT: %@", stringFromDAte);
NSDate *currentDadte = [dateFormatter dateFromString:stringFromDAte];
NSTimeInterval interval = [currentDadte timeIntervalSinceDate:[NSDate date]];
return [self dailyLanguage:interval];
但是当我换算时,时间是不正确的。我需要得到接收时间的UTC时间。但是我得到的是时间值,没有偏移值
例如:如果josnDate=1354851639500+0530,
我得到了,2012-12-07 03:40:39 GMT上午,但我应该得到2012-12-07 09:10:39(大约)
我该怎么做?请帮忙。你可以试试这个
NSString *jsonDateString = [SingleResponseObject objectForKey:@"datetime"];;
NSInteger offset = [[NSTimeZone defaultTimeZone] secondsFromGMT];
NSTimeInterval unixTime = [[jsonDateString substringWithRange:NSMakeRange(0, 13)] doubleValue] / 1000;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
[dateFormatter setTimeZone:timeZone];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a ZZZZ"];
NSString *stringFromDAte = [dateFormatter stringFromDate:[[NSDate dateWithTimeIntervalSince1970:unixTime] dateByAddingTimeInterval:offset]];
cell.date.text = stringFromDAte;
试试这个代码
- (NSDate *)deserializeJsonDateString: (NSString *)jsonDateString
{
NSInteger offset = [[NSTimeZone defaultTimeZone] secondsFromGMT]; //get number of seconds to add or subtract according to the client default time zone
NSInteger startPosition = [jsonDateString rangeOfString:@"("].location + 1; //start of the date value
NSTimeInterval unixTime = [[jsonDateString substringWithRange:NSMakeRange(startPosition, 13)] doubleValue] / 1000; //WCF will send 13 digit-long value for the time interval since 1970 (millisecond precision) whereas iOS works with 10 digit-long values (second precision), hence the divide by 1000
[[NSDate dateWithTimeIntervalSince1970:unixTime] dateByAddingTimeInterval:offset];
return date;
}
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观察:如果要使用过去的日期,则使用NSMakeRange(0,13)是危险的。观察:不清楚传入的时间值是否经过时区调整。如果是时区调整(非UTC),则需要减去传入的时区偏移量。在服务器上,它获取当前时间并将其转换为UTC时间格式。
+0530
是两个日期之间的差异。这是有道理的。将偏移量转换为NSDate而不进行任何调整,然后NSLog它,以查看它转换为什么。