I have stored a date in a text file, and I can read it out properly. The output for this string is
"6:00 PM"
Just like that. However, when I do:
//First, set the first datePicker
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
NSString *breakfastTimeStartLocation = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:#"breakfastTimeStart.txt"];
NSString *time = [NSString stringWithContentsOfFile:breakfastTimeStartLocation encoding:NSUTF16StringEncoding error:nil];
NSLog(#"Loaded time is %#", time);
NSDate *startDate = [dateFormatter dateFromString:time];
NSLog(#"Start Date = %#", startDate);
In this, time returns the "6:00 PM", but startDate returns "(null)"
I must be missing something, why in the world does this not work?
Thanks.
I believe the issue is that you never set a Date Format. Even if this is not the only problem it would probably be one. Try something like:
[dateFormatter setDateFormat:#"MM/dd/YYYY"];
That's not the right way to init an NSDateFormatter, the designated initializer is initWithDateFormat:allowNaturalLanguage:
Thus:
NSDateFormatter *dateFormat = [[NSDateFormatter alloc]
initWithDateFormat:#"h:mm a" allowNaturalLanguage:NO];
Related
I have a NSDate which is not being correctly formatted.
I have declared a UITextField in the .h :
#property (weak, nonatomic) IBOutlet UITextField *datetimeTextField;
Then I have a 3rd party UIPicker that picks a Date and inserts it in the mentioned TextField:
// Method to avoid diplaying the keyboard.
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
ActionSheetDatePicker *datePicker = [[ActionSheetDatePicker alloc]initWithTitle:#"Select Date and Time" datePickerMode:UIDatePickerModeDateAndTime selectedDate:[NSDate date] doneBlock:^(ActionSheetDatePicker *picker, id selectedDate, id origin) {
// As you can see here it's taking the correct (non-formatted) date
NSLog(#"Selected %#", selectedDate); // VALUE = Sat Nov 10 10:00:41 2018
//create a date formatter
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
//set its format as the required output format
[formatter setDateFormat:#"dd-MM-yyyy HH:mm:ss"];
//get the output date as string
NSString *selectedDateString = [formatter stringFromDate:selectedDate];
self.datetimeTextField.text = selectedDateString;
// And here I get the value I want to store in Parse stored in datetimeTextField.text
NSLog(#"Selected After reformat %#", self.datetimeTextField.text); // VALUE = 10-11-2018 00:35:06
} cancelBlock:^(ActionSheetDatePicker *picker) {
} origin:self.view];
datePicker.minuteInterval = 5;
[datePicker showActionSheetPicker];
return NO;
}
My problem starts when I have to call an IBAction to store this NSDate in my Parse Cloud (I have a Date column that would only accept NSDate.
- (IBAction)createeventAction:(id)sender{
// Here I "catch" the value previously stored from the Picker.
NSString *dateString = datetimeTextField.text; //// 07-11-2018 22:00:42 (correct format)
// Here I convert the NSString into NSDate with the same formatting
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd-MM-yyyy HH:mm:ss"];
NSDate *date = [dateFormatter dateFromString:dateString];
// But for some reason, date prints incorrectly.
NSLog(#"DATE in here ====>>> %#", date); // Sat Nov 10 10:00:41 2018
}
Problem:
I would like to convert a NSString (datetimeTextField.text) to a NSDate without losing the format.
EDIT 1:
I had consulted the accepted answer from this question How to convert NSStrings to NSDate but for some reason, it does not work for me.
EDIT 2:
To make it more clear:
Code to convert NSDate to NSString.
// We have a date (not formatted) => Sat Nov 10 10:00:41 2018
//create a date formatter
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"dd-MM-yyyy HH:mm:ss"];
NSString *selectedDateString = [formatter stringFromDate:selectedDate];
self.datetimeTextField.text = selectedDateString;
// Date formatted => 10-11-2018 00:35:06
Code to convert NSString back to NSDate:
NSString *dateString = datetimeTextField.text; // 10-11-2018 10:00:41 (correct format)
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd-MM-yyyy HH:mm:ss"];
NSDate *date = [dateFormatter dateFromString:dateString];
NSLog(#"DATE in here ====>>> %#", date); // Sat Nov 10 10:00:41 2018 (not formatted. WHY?)
Well thats the thing. I need to have a NSDate because I am storing dates.
You seem to misunderstand the difference between NSDate and what you get back from NSDateFormatter. NSDate is just a class that stores a date in no particular format -- it stores the information inside the object. If you want to display the date in a particular format, you need to create a string from the date, and you use NSDateFormatter to do convert your date into a string that expresses the date in the format you need.
If you print the date to the console using NSLog(), like:
NSLog("My date is %#", myDate);
then NSLog will just use the date's description method, which gives you a sort of default expression of the date. If you want to log the date in some specific format, you'll need to set up a date formatter with that format and then use it:
NSLog("My formatted date is %#", [myFormatter stringFromDate:myDate]);
In the end it turned out that my code was fine. Only thing is that I did not notice that the Date was declared as String in Parse instead of as Date.
I have a string with value #"15/11/13". I need to display the same on the label in the nib file.
I am using the following code to display it
NSDateFormatter * df1 = [[NSDateFormatter alloc] init];
[df1 setDateFormat:#"yyyy-mm-dd"];
[df1 setDateStyle:NSDateFormatterShortStyle];
[df1 setTimeStyle:NSDateFormatterNoStyle];
[profile1 setLastPromotionDate:[df1 dateFromString:#"11/11/13"]];
Profile1 is a different class which has lastPromotonDate of type NSDate.
In the nib file I have a outlet to display date which is bound to lastPromotionDate.
When I run the app, the date displayed is Monday, 11 November 2013 12:00:00 AM India Standard Time.
Can I know what is the mistake here? What has to be done so the date displays in this format : 11/11/13
Try this:-
NSString *dateStr=#"11/11/13";
NSDateFormatter *format=[[[NSDateFormatter alloc]init]autorelease];
[format setDateFormat:#"dd/mm/yy"];
NSDate *dt=[format dateFromString:dateStr];
NSString *str=[format stringFromDate:dt];
NSLog(#"%#",str);
NSString *str = #"15/11/13";
// here we create NSDateFormatter object for change the Format of date..
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init] ;
// here set format of date which is in your output date (means above str with format)
[dateFormatter setDateFormat:#"yy/mm/dd"];
// here you can fetch date from string with define format
NSDate *date = [dateFormatter dateFromString: str];
dateFormatter = [[NSDateFormatter alloc] init] ;
// here set format which you want..
[dateFormatter setDateFormat:#"dd/mm/yy"];
NSString *convertedString = [dateFormatter stringFromDate:date];
//here convert date in NSString
NSLog(#"Converted String : %#",convertedString);
rofile1.text = convertedString;
Why not just set it as:
NSString *str = #"15/11/13";
[label setStringValue: str];
UPDATE:
To convert this string to NSDate of the same format use:
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"dd/mm/yy"];
NSDate * date = [df dateFromString:str];
To get back the string value of date from NSDate use:
NSString *dateStr = [df stringFromDate: date];
Also you may use this dateStr to set you label text as
[label setStringValue: dateStr];
or bind the label to "dateStr". (Do not bind it to "date" of NSDate type, I think this is where you are going wrong).
Use "date" variable that is of NSDate type for your server requests.
UPDATE:
Since you are binding your label to NSDate value, it displays the complete date in the way it is present in NSDate. To retrieve the value of that NSDate in your custom format, you need to use NSDateFormatter that will write the part of NSDate that we need in our format to a NSString.
Also if we convert a NSString to NSDate, it doesn't mean that date formatter will save the NSDate in our custom format, the format of the date formatter specify the format of our string so that NSDate could read the correct date from our custom formatted string. But NSDate will always save the date value in its own format.
We have something called DateFormatter under objects in the library. We can drag and drop that under the text cell if the label in the list view of the nib.
This data formatter converts the date format to string value which is used to display in the UI.
I'm having problems converting a string into a NSDate object and I'm not sure why.
NSString* tester= #"2012-11-26T10:20:40.187";
NSLog(#"", tester); //Print the Date String
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"];
NSDate *date = [formatter dateFromString:tester]; //Store the date
NSDateFormatter *output = [[NSDateFormatter alloc] init];
[output setDateStyle:NSDateFormatterMediumStyle];
NSLog(#"DATE OBJECT:%#\nDATE STRING: \"%#\"", [output stringFromDate:date]); //Print the NSDate object and the string
But all I seem to get is:
DATE OBJECT:(null)
DATE STRING: "2012-11-26T10:20:40.187"
I figure it has something to do with the .187 but I'm not sure. I'm sorry if this is a duplicate but I couldn't figure this out.
Thank you very much in advance!
The abbrevation for milliseconds is "S"not Z which is TimeZone.
It seems that you have read the correct document where that example is from, but
you missed the link to the Unicode Technical Standard #35.
See NsDateFormatter Docu, search for "Formatters in Mac OS X v10.4 use version tr35-4."
try that below:
[formatter setDateFormat:#"yyyy'-'MM'-'dd'T'HH':'mm':'ss.SSS"];
See also NSDateFormatter Question
I have looked at other examples and I am still not able to convert this string to a date. After i run this code I get the following output from the NSLogs:
Prediction Conversion: 2012-07-01 00:00:00 +0000
Timestamp Conversion: 2012-06-24 00:00:00 +0000
Prediction: 604800.000000
Which isn't the hard coded dates i used. Does anyone know why? Code is below:
NSString *timeStamp = #"20120620 19:23";//[[predictionData objectAtIndex:0 ] valueForKey:#"tmstmp"];
NSString *predictionTime = #"20120620 19:30";// [[predictionData objectAtIndex:0 ] valueForKey:#"prdtm"];
NSDateFormatter *ts = [[NSDateFormatter alloc] init];
[ts setDateFormat:#"yyyyMMdd HH:dd"];
NSDate *convertedTS = [ts dateFromString:timeStamp];
NSDateFormatter *pt = [[NSDateFormatter alloc] init];
[pt setDateFormat:#"yyyyMMdd HH:dd"];
NSDate *convertedPT = [pt dateFromString:predictionTime];
NSTimeInterval timeDifference = [convertedPT timeIntervalSinceDate:convertedTS];
NSLog(#"Prediction Conversion: %#", [convertedPT description]);
NSLog(#"Timestamp Conversion: %#", [convertedTS description]);
NSLog(#"Prediction: %f", timeDifference);
Thanks!
You are using dd for your minutes instead of mm. This:
[ts setDateFormat:#"yyyyMMdd HH:dd"];
Should be this:
[ts setDateFormat:#"yyyyMMdd HH:mm"];
You formatter string is incorrect.
HH:dd
should be
HH:mm
In addition, you need to take the timezone into consideration. Without +XXXX specified, UTC is used by default. To set the timezone:
[ts setTimeZone:[NSTimeZone /*timezone*/]];
where /*timezone*/ is specified by the NSTimeZone class. There are many different ways of using a timezone (and many different timezones), so choose the one that is best for you.
You need to set the locale, set it to en_us_POSIX.
ts.locale = [[NSLocale alloc] initWithLocaleIdentifier:#"en_us_POSIX"];
also, it should be HH:mm, not dd
Ive been racking my brains with no luck. Could someone please tell me how i would convert this string:
"2011-01-13T17:00:00+11:00"
into a NSDate?
The unicode date format doc is here
Also, for your situation, you could try this:
// original string
NSString *str = [NSString stringWithFormat:#"2011-01-13T17:00:00+11:00"];
// convert to date
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
// ignore +11 and use timezone name instead of seconds from gmt
[dateFormat setDateFormat:#"YYYY-MM-dd'T'HH:mm:ss'+11:00'"];
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:#"Australia/Melbourne"]];
NSDate *dte = [dateFormat dateFromString:str];
NSLog(#"Date: %#", dte);
// back to string
NSDateFormatter *dateFormat2 = [[NSDateFormatter alloc] init];
[dateFormat2 setDateFormat:#"YYYY-MM-dd'T'HH:mm:ssZZZ"];
[dateFormat2 setTimeZone:[NSTimeZone timeZoneWithName:#"Australia/Melbourne"]];
NSString *dateString = [dateFormat2 stringFromDate:dte];
NSLog(#"DateString: %#", dateString);
[dateFormat release];
[dateFormat2 release];
Hope this helps.
put the T part in single quotes, and check the unicode docs for the exact formatting. In my case, I have something similar, which I do this:
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"YYYY-MM-dd'T'HH:mm:ss.SSS"];
Again, not exactly the same, but you get the idea. Also, be careful of the timezones when converting back and forth between strings and nsdates.
Again, in my case, I use:
[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:#"America/New_York"]];
Did you try this
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSDate *dateT = [dateFormatter dateFromString:str];
Cheers
You might check out TouchTime.
https://github.com/jheising/TouchTime.
It's a direct port of the awesome strtotime function in PHP in 5.4 for Cocoa and iOS. It will take in pretty much any arbitrary format of date or time string and convert it to an NSDate.
Hope it works, and enjoy!
Try using this cocoapods enabled project. There are many added functions that will probably be needed as well.
"A category to extend Cocoa's NSDate class with some convenience functions."
https://github.com/billymeltdown/nsdate-helper
Here's an example from their page:
NSDate *date = [NSDate dateFromString:#"2009-03-01 12:15:23"];