DatePicker stopping CoreData working as expected - iphone

Question

I have an app which saves text and the date from a UIDatePicker and then shows that note if you got back into that date in the UIDatePicker.
It works great! Only I have found that setting the UIDatePicker date to today stops CoreData working.
It's only when I run this setDate line does it stop core data from working. The app runs fine without crashing, it just doesn't save any data. If I comment that line out, it works a charm. But I need to have the UIDatePicker on today when the app loads.
I use this when the application starts:
NSDate *now = [[NSDate alloc] init];
[datePicker setDate:now];
This to fetch the note:
NSFetchRequest *fetch = [[NSFetchRequest alloc] init];
NSEntityDescription *testEntity = [NSEntityDescription entityForName:#"DatedText" inManagedObjectContext:self.managedObjectContext];
[fetch setEntity:testEntity];
NSPredicate *pred = [NSPredicate predicateWithFormat:#"dateSaved == %#", datePicker.date];
[fetch setPredicate:pred];
NSError *fetchError = nil;
NSArray *fetchedObjs = [self.managedObjectContext executeFetchRequest:fetch error:&fetchError];
if (fetchError != nil) {
NSLog(#"fetchError = %#, details = %#",fetchError,fetchError.userInfo);
}
noteTextView.text = [[fetchedObjs objectAtIndex:0] valueForKey:#"savedText"];
And this to save the note:
NSManagedObject *newDatedText;
newDatedText = [NSEntityDescription insertNewObjectForEntityForName:#"DatedText" inManagedObjectContext:self.managedObjectContext];
[newDatedText setValue:noteTextView.text forKey:#"savedText"];
[newDatedText setValue:datePicker.date forKey:#"dateSaved"];
NSError *saveError = nil;
[self.managedObjectContext save:&saveError];
if (saveError != nil) {
NSLog(#"[%# saveContext] Error saving context: Error = %#, details = %#",[self class], saveError,saveError.userInfo);
}

Answer 1

Remember NSDate saves not only DD/MM/YYYY but also HH:MM:SS.
At a guess I think when you pick a DD/MM/YYYY from the picker, it saves with a default time of 0:00:00 but in the case above when you set the picker date to now you are actually manipulating the HH:MM:SS to something else (even though you don't see it manually).
To illustrate what I'm trying to say, when you fetch is with a predicate of (dateSaved == picker.date) it is looking for a date in the format DD/MM/YYYY 00:00:00 and for arguments sake you may have saved it on DD/MM/YYYY 09:00:01.
You will need to do some formatting of your NSDate attribute if you want this to work.

Answer 2

Datepicker is by default set to todays date only. You don't need to do it manually.