Perform task once a day [closed] - iphone

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How would you go about performing a task once day?
In my case, I need to check if contact information has changed. (Contact information is in a big CSV file on amazon S3).
One way I thought is to save last date checked into a file then read it back from it when the application starts. But I feel that's so amateur.
Should I use core data? (Tested it a long while ago, just popped in my head).
Is there any better way of doing it?

Answer 1

You can achieve this by using NSUserDefaults on your AppDelegate.
An easy representation for saving;
[[NSUserDefaults standardUserDefaults] setObject:#"YourDateHere" forKey:#"lastAmazonCheckDate"];
[[NSUserDefaults standardUserDefaults] syncronize];
And retrieving;
[[NSUserDefaults standardUserDefaults] objectForKey:#"lastAmazonCheckDate"];
With NSUserDefaults you can save the last time you checked for your list.

Answer 2

_lastUpdate is a NSDate object
_lastUpdate = [NSDate date];
- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view
{
return _lastUpdate;
}
so like this you can check and update your task everyday i think you know this as you mentioned but i also have the only solution for now.