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PONSDate - Change Time Component
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copied!<p>This is probably a silly question but I can't seem to find an answer. </p> <p>I am using a date picker to allow a user to enter a date and it is also setting the time to the current time (I init the picker with [NSDate date]).</p> <p>Is there a way to change the time component of the date? I am later calculating time intervals which returns seconds and I am getting some odd behavior because of the time. </p> <p>This code shows the date entry:</p> <pre><code>@implementation AddEventViewController @synthesize backgroundColor, nameField, dateField, datePicker, eventName, eventDate; -(void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; self.view.backgroundColor = self.backgroundColor; } - (void)viewDidLoad { [super viewDidLoad]; dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateStyle:NSDateFormatterMediumStyle]; [dateFormatter setTimeStyle:NSDateFormatterNoStyle]; CGSize size = self.view.bounds.size; CGRect frame = CGRectMake(0, size.height - 216, 320, 216); datePicker = [[UIDatePicker alloc] initWithFrame: frame]; datePicker.datePickerMode = UIDatePickerModeDate; datePicker.hidden = YES; datePicker.date = [NSDate date]; [datePicker addTarget:self action:@selector(changeDateInLabel:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview: datePicker]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } -(IBAction)doneButton { if ((nameField.text != nil)) { self.eventName = nameField.text; self.eventDate = datePicker.date; [[NSNotificationCenter defaultCenter]postNotificationName:@"EventAddDone" object:nil]; } else { UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Enter Event Name" message:nil delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil]; [alertView show]; [alertView release]; } } -(IBAction)cancelButton { [[NSNotificationCenter defaultCenter]postNotificationName:@"EventAddCancel" object:nil]; } - (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return YES; } - (void)changeDateInLabel:(id)sender { dateField.text = [dateFormatter stringFromDate:[datePicker date]]; } - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { if(textField == dateField) { dateField.placeholder = @" "; dateField.text = [dateFormatter stringFromDate:[datePicker date]]; datePicker.hidden = NO; [nameField resignFirstResponder]; return NO; } return YES; } - (void)dealloc { self.backgroundColor = nil; self.nameField = nil; self.dateField = nil; self.datePicker = nil; self.eventName = nil; self.eventDate = nil; [dateFormatter release]; [super dealloc]; } @end </code></pre> <p>My use of the recorded date is similar to the following:</p> <pre><code>NSTimeInterval age = [enteredDate timeIntervalSinceNow]; //do some math on the age variable to get number of days since the event occurred. </code></pre>

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