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getting current time from server on iphone

Posted on 2011-09-15
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Last Modified: 2012-05-12
Dear All,

am trying to write application for iphone this application shows current time and date but not from the iphone i need to get it from server for example microsoft windows server.

Best regards
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Question by:deniro1974
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LVL 13

Accepted Solution

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SpeedyApocalypse earned 2000 total points
ID: 36545836
On your server, you will need to have a .php file (or something similar that can output data based on your current server time).  From there, you can make a connection to the URL through one of the following:

+[NSData dataWithContentsOfURL:]
-NSURLConnection
-ASIHTTPRequest

All three of these options will retrieve what you have from your server and download them as data onto your iOS application.

Here is an example:

PHP CODE:
<?php 
die(date(DATE_RFC822));
?>

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OBJC CODE:
NSString *time_and_date = [[NSString alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.example.com"] encoding:NSUTF8StringEncoding]];
[time_and_date release];

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Author Comment

by:deniro1974
ID: 36555534
can i use this in timer like every 1 sec for example it will not put traffic on the network or it will not make the Iphone or application became slow or something
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LVL 13

Expert Comment

by:SpeedyApocalypse
ID: 36555539
You are downloading the data synchronously, so it will lag the main thread.

You can just transform the data you download into an NSDate object and increment that each second, hence increasing the server time without redownloading.
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Author Comment

by:deniro1974
ID: 36555573
how we can increment it as i understand i can get the time one time in the application lunch  ans start to increment it every seconds but how i can do this
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LVL 13

Expert Comment

by:SpeedyApocalypse
ID: 36555579
Look into the NSDateFormatter and NSDate class reference.  If you have code issues, post your code and I can assist with it.
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Author Comment

by:deniro1974
ID: 36555688
now i tried the code you give to me and when the application start its crash any idea?
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Author Comment

by:deniro1974
ID: 36555896
thanks very much its working now but i had to use the below code

 
NSData *dataurl =	[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://example.com"]] ;
	
	
					 NSString *ahmad = [[NSString alloc] initWithData:dataurl encoding:NSUTF8StringEncoding];	

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