Suppose, an user has set a custom date format in the Languages and Region section of System Preferences. Screenshot - http://imgur.com/gallery/dMy8u
I have this date in NSString representation (eg - #"201603/11") and I'd like to convert it to my own date format i.e. "MM/dd/yyyy". I'm using the following code:
NSDateFormatter *formatter = [NSDateFormatter new];
formatter.dateFormat = [NSDateFormatter dateFormatFromTemplate:#"MM/dd/yyyy"
options:0
locale:[NSLocale systemLocale]];
[formatter setDateStyle:NSDateFormatterShortStyle];
NSDate *localDate = [formatter dateFromString:#"201603/11"];
But localDate always returns nil.
In short, my NSString representation is 201603/11 (format set by user), and I'd like to get this in NSDate representation.
// User Date format
NSDateFormatter *userFormatter = [NSDateFormatter new];
[userFormatter setDateFormat: #"yyyyMM/dd"];
NSDate *localDate = [userFormatter dateFromString:#"201610/31"];
NSLog(#"%#",localDate); //You will get, Year: 2016, Month:10, Day: 31
// The date format you want
NSDateFormatter *myFormatter = [NSDateFormatter new];
[myFormatter setDateFormat: #"MM/dd/yyyy"];
// Get date string from your local date object
NSString *myDateString = [myFormatter stringFromDate:localDate];
NSLog(#"%#",myDateString); //You will get a string, 10/31/2016
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.
My python backend uses the isoformat() method on UTC date times, which results in strings that look like 2014-01-14T18:07:09.037000. Following other examples, I'm trying to create NSDates from those strings (passed up in JSON packets):
NSDateFormatter *dateFormatter = [NSDateFormatter new];
[dateFormatter setDateFormat:#"yyyy-MM-dd'T'HH:mm:S"];
NSLog(#"cycle_base %#", myFields[#"cycle_base"]);
self.cycleBase = [dateFormatter dateFromString: myFields[#"cycle_base"]];
NSLog(#"cycleBase %#", self.cycleBase);
I've tried variants on the S part (which is supposed to be fractional seconds?) of the format string, but to no avail. I always get a nil back. What am I doing wrong?
iOS 7 follows the Unicode Technical Standard #35, which is a list of format patterns.
In this document you will find that the format string for fractional seconds is capitalized S.
NSString *string = #"2014-01-14T18:07:09.037000";
NSDateFormatter *formatter = [NSDateFormatter new];
formatter.dateFormat = #"yyyy-MM-dd'T'HH:mm:ss.S";
NSDate *date = [formatter dateFromString:string];
NSLog(#"%#", date);
This will net you a valid NSDate object. Don't forget to set the proper time zone and locale on your NSDateFormatter object.
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 have the following code:
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = #"yyyy-mm-dd";
NSDate *cDate = [formatter dateFromString:thisLine];
NSLog(#"cDate '%#' thisLine '%#'", cDate, thisLine);
NSLog prints:
cDate '2011-01-10 05:07:00 +0000' thisLine '2011-07-10'
while cDate should be '2011-07-10'
Any thoughts?
Thanks
Lowercase mm is for minutes not months, month use uppercase MM:
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = #"yyyy-MM-dd";
NSDate *cDate = [formatter dateFromString:thisLine];
NSLog(#"cDate '%#' thisLine '%#'", cDate, thisLine);
The NSDate description will always print the date with its own formatting, generally for the +000 time zone. You need to use the date format to get the correctly formatted date and use MM for month not mm.
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = #"yyyy-MM-dd";
NSDate *cDate = [formatter dateFromString:thisLine];
NSLog(#"cDate '%#' thisLine '%#'", [formatter stringFromDate:cDate], thisLine);
-(NSString*)description
Discussion The representation is not guaranteed to remain
constant across different releases of the operating system. To format
a date, you should use a date formatter object instead (see
NSDateFormatter and Data Formatting Guide)
First of all I want to say thanks in advance for helping me.
I want to know how can I create a date on a label using Xcode,
and the date will follow the same date like in iphone.
Thanks
Here's one simple approach
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
//uncomment to get the time only
//[formatter setDateFormat:#"hh:mm a"];
//[formatter setDateFormat:#"MMM dd, YYYY"];
[formatter setDateStyle:NSDateFormatterMediumStyle];
//get the date today
NSString *dateToday = [formatter stringFromDate:[NSDate date]];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320.0f, 20.0f)];
[label setText:dateToday];
[formatter release];
//then add to a view
Creating the text date is simple, but the real question is what is your data source that you want to make the date text out of?
The date can be formatted and set in label as below.
NSDate *today = [NSDate date];
NSDateFormatter *dformat = [[NSDateFormatter alloc] init];
[dformat setDateFormat:#"dd:MM:YYYY"];
myLabel.text = [dformat stringFromDate:today];
NSDateFormatter handle format of string dates.
Instances of NSDateFormatter create string representations of NSDate objects, and convert textual representations of dates and times into NSDate objects.
Try this and see:
// Set date format according to your string date format
// e.g.: For,
// 22-12-1996 -> #"dd-MM-yyyy"
// 22/12/1996 -> #"dd/MM/yyyy"
// 1996-12-22 03:45:20 -> #"yyyy-MM-dd HH:mm:ss"
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = #"dd/MM/yyyy";
//dateFormatter.dateFormat = #"dd-MM-yyyy";
NSDate *date = [dateFormatter dateFromString:dateString];
if(date == nil) {
correctFormat = false;
}
NSLog("Date: %#",date);
Note: Each pairs of characters in date format relates relevant date component with date instance. You can create any type of date format using date string pattern.
Here is document by Apple: Date Formatters
Date (Day): dd
Month: MM or MMM or MMMM
Year: yy or yyyy
Here is list of date formats: Date Formats
Here is solution in Swift
var today = Date()
var d_format = DateFormatter()
d_format.dateFormat = "dd:MM:yyyy"
label.text = dformat.string(from: today)