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PODifferent result for [NSDate date] in several devices
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  1. PODifferent result for [NSDate date] in several devices
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    copied!<p>To start, I have to say that I set autoset in date&amp;time settings and time zone is the same for each device. So I use <code>[NSDate date]</code> to get time stamp in milliseconds, then encode to <code>NSData</code> and send to another device. On receiver data is being decoded and subtract with new <code>[NSDate date]</code>. So that I get total time needed for send and receive message. That I was thought because when sender is iPhone 4 iOS6 and receiver is iPhone 5 iOS7 then receiver have earlier time stamp than sender. I don't know why? Maybe <code>[NSData date]</code> isn't the most reliable class for that kind of operations? I use <code>GCDAsyncUdpSocket</code> for sending/receiving UDP.</p> <p>Code sender</p> <pre><code>NSData *data2 = [self createRandomNSData:8192]; NSMutableData *dataToSend =[NSMutableData data]; [dataToSend appendBytes:&amp;tag length:sizeof(int)]; long long currentTimeStamp = (long long)([[NSDate date] timeIntervalSince1970]*1000.0); [dataToSend appendBytes:&amp;currentTimeStamp length:sizeof(long long)]; [dataToSend appendData:data2]; NSLog(@"%i || %lld || %lu",tag, currentTimeStamp,(unsigned long)[dataToSend length]); [_udpSocket sendData:dataToSend toHost:@"230.0.0.1" port:_port withTimeout:-1 tag:tag]; tag++; </code></pre> <p>Code receiver</p> <pre><code>char* dataBytes = [data bytes]; int inTag; long long inCurrentTimeStamp; [data getBytes:&amp;inTag length:sizeof(int)]; [data getBytes:&amp;inCurrentTimeStamp range:NSMakeRange(sizeof(int), sizeof(long long))]; long long currentTimeStamp = (long long)([[NSDate date] timeIntervalSince1970]*1000.0); long long timeStampDiff = currentTimeStamp - inCurrentTimeStamp; self.delay = timeStampDiff; NSLog(@"%i || %lld || %lu",inTag, timeStampDiff,(unsigned long)[data length]); </code></pre>
 

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