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PODate difference between UIDatepicker and NSDate
 

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  1. PODate difference between UIDatepicker and NSDate
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    <p>I have a datepicker and I save the value to .plist file with key UserDate in string format.</p> <p>The value returns from datepicker is in <code>2013-02-13 11:17:34 +0000</code> format.</p> <p>In order to save it into to .plist file I need to convert datepicker to string <code>2013-02-14T19:17:34Z</code></p> <p>In other View, I want to retrieve back the UserDate from plist and compare with the user current date. I want days and hours different. </p> <p>I convert and pass <code>2012-02-12 19:17:34 +0800</code> as <code>destinationDate</code> to compare with [NSDate new]. I managed to calculate the difference between two date. But the result is not correct.</p> <h2>How to get the correct difference result for two dates between iPhone's date and Datepicker's date? Do I need to use a specific timezone?</h2> <p><strong>Extra info</strong>: I live in GMT+8. I set the simulator datepicker to Feb 13 2012, yet the result still say the countdown has 18hours and 4 minutes.</p> <pre><code>NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; int units = NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *components = [calendar components:units fromDate:[NSDate date] toDate:destinationDate options:0]; [datelabel setText:[NSString stringWithFormat:@"%d%c %d%c %d%c %d%c %d%c", [components month], 'm', [components day], 'd', [components hour], 'h', [components minute], 'm', [components second], 's']]; </code></pre> <p>NSLog</p> <p><img src="https://i.stack.imgur.com/8iu7m.png" alt="enter image description here"></p> <p><strong>Edit</strong></p> <p>Plist file.</p> <p><img src="https://i.stack.imgur.com/yB12F.png" alt="enter image description here"></p> <p>save method</p> <pre><code>NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); // get documents path NSString *documentsPath = [paths objectAtIndex:0]; // get the path to our Data/plist file NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"]; // set the variables to the values in the text fields self.userTitle = myTitle.text; self.userMessage = myMessage.text; NSLog(@"METHOD SAVE"); NSLog(@"Datepicker value = %@", myDate.date ); NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4]; [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"]; NSString *mdate = [dateFormatter stringFromDate:myDate.date]; // [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"]; NSLog(@"Converted from date picker, save into plist = %@", mdate ); self.saveDate = mdate; //self.userDate = myDate.date; // create dictionary with values in UITextFields NSDictionary *plistDict = [NSDictionary dictionaryWithObjects: [NSArray arrayWithObjects: userTitle, userMessage, saveDate, nil] forKeys:[NSArray arrayWithObjects: @"Title", @"Message", @"UserDate", nil]]; NSString *error = nil; // create NSData from dictionary NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&amp;error]; // check is plistData exists if(plistData) { // write plistData to our Data.plist file [plistData writeToFile:plistPath atomically:YES]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Success" message:@"Your settings have been saved." delegate:self cancelButtonTitle:nil otherButtonTitles:@"Ok",nil]; [alert show]; } else { NSLog(@"Error in saveData: %@", error); //[error release]; } </code></pre> <p>viewWillAppear</p> <pre><code>- (void)viewWillAppear:(BOOL)animated { [self.navigationController setNavigationBarHidden:YES]; [super viewWillAppear:animated]; // Data.plist code // get paths from root direcory NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); // get documents path NSString *documentsPath = [paths objectAtIndex:0]; // get the path to our Data/plist file NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"]; // check to see if Data.plist exists in documents if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath]) { // if not in documents, get property list from main bundle plistPath = [[NSBundle mainBundle] pathForResource:@"Data" ofType:@"plist"]; } // read property list into memory as an NSData object NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath]; NSString *errorDesc = nil; NSPropertyListFormat format; // convert static property liost into dictionary object NSDictionary *temp = (NSDictionary *)[NSPropertyListSerialization propertyListFromData:plistXML mutabilityOption:NSPropertyListMutableContainersAndLeaves format:&amp;format errorDescription:&amp;errorDesc]; if (!temp) { NSLog(@"Error reading plist: %@, format: %d", errorDesc, format); } NSLog(@"Plist Title: %@", [temp objectForKey:@"Title"]); NSLog(@"Plist Message: %@", [temp objectForKey:@"Message"]); NSLog(@"Plist date: %@", [temp objectForKey:@"UserDate"]); userTitle.text = [NSString localizedStringWithFormat:@"%@", [temp objectForKey:@"Title"]]; userMessage.text = [NSString localizedStringWithFormat:@"%@", [temp objectForKey:@"Message"]]; //http://stackoverflow.com/questions/1070354/how-do-i-get-the-current-date-in-cocoa NSDate* now = [[NSDate alloc] initWithTimeIntervalSinceNow:3600]; userCoundown.text = [NSString stringWithFormat:@"%@",now]; NSString *uDate = [[NSString alloc] init]; uDate = [temp objectForKey:@"UserDate"]; NSLog(@"Plist date in string - %@", uDate); NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4]; [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"]; NSDate *ddate = [dateFormatter dateFromString:uDate]; [dateFormatter setDateFormat:@"yyyy-MM-dd H:mm:ss Z"]; NSLog(@"Format date from Plist - %@", [dateFormatter stringFromDate:ddate]); //NSLog(@"GMT format from Plist - %@", timeStamp); //http://www.epochconverter.com/# destinationDate = ddate; timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateLabel) userInfo:nil repeats:YES]; } </code></pre> <p>updatelabel</p> <pre><code>-(void)updateLabel { NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; int units = NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *components = [calendar components:units fromDate:[NSDate date] toDate:destinationDate options:0]; [datelabel setText:[NSString stringWithFormat:@"%d%c %d%c %d%c %d%c %d%c", [components month], 'm', [components day], 'd', [components hour], 'h', [components minute], 'm', [components second], 's']]; } </code></pre>
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    1. COYou can save an `NSDate` directly into a plist, it will be automatically converted to an ISO 8601 string format. On reading the plist the `NSData` will be converted back to an `NSDate`.
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      1. USzaph
    2. COYou should show us more of your code; ideally an entire sequence of statements that reproduces the problem, not just a small portion of it, and especially the code you're using to 1) convert an NSDate into a string and save it to the plist 2) retrieve the date from the plist and make it into a date.
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      1. USyuji
    3. COtop comment is right..but incomplete..:P .. you can save array,dictionary,data,string,integers etc in a plist file directly.. just make an array with an NSDate object and make a plist of it...then later get the plist..get the array..and you will get the appropriate date at its objectAtIndex :0 ..then compare..
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      1. USShubhank
 

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