gistfile1.m

/**
 * This will convert DateTime (.NET) object serialized as JSON by WCF to a NSDate object.
 */
+ (NSDate *)dateFromJSONTicks:(NSString *)inputString;

gistfile2.m

+ (NSDate *)dateFromJSONTicks:(NSString *)inputString
{
	/* Input string is something like: "/Date(1292851800000+0100)/" where
	 1292851800000 is milliseconds since 1970 and +0100 is the timezone. */
	
	/* A range of NSMakeRange(6, 10) will generate "1292851800" from "/Date(1292851800000+0100)/"
	 as in example above. We crop additional three zeros, because "dateWithTimeIntervalSince1970:"
	 wants seconds, not milliseconds; since 1 second is equal to 1000 milliseconds, this will work.
	 Note: if you don't care about timezone changes, just chop out "dateByAddingTimeInterval:offset" part. */
	
	NSTimeInterval timeInterval = [[inputString substringWithRange:NSMakeRange(6, 10)] doubleValue];
	NSDate *result = [NSDate dateWithTimeIntervalSince1970:timeInterval];
	return result;
}