find total number of days between two dates in iphone

Question

I would like to find total number of days between two dates.

e.g. today is 01-01-2011(DD-MM-YYYY) and second date is (25-03-2011), how would I find the total number of days?

NSDate *currentdate=[NSDate date];
NSLog(@"curretdate is ==%@",currentdate);
NSDateFormatter *tempFormatter1 = [[[NSDateFormatter alloc]init]autorelease];
[tempFormatter1 setDateFormat:@"dd-mm-YYYY hh:mm:ss"];
NSDate *toDate = [tempFormatter1 dateFromString:@"20-04-2011 09:00:00"];

NSLog(@"toDate ==%@",toDate);

Answer 1

In your date Format tor u set wrong it`s be dd-MM-yyyy HH:mm:ss . may be that was the problem.. u get wrong date and not get answer i send litte bit code for get day diffrence.

  NSDateFormatter *tempFormatter = [[[NSDateFormatter alloc]init]autorelease];
 [tempFormatter setDateFormat:@"dd-MM-yyyy HH:mm:ss"];
  NSDate *startdate = [tempFormatter dateFromString:@"15-01-2011 09:00:00"];
  NSLog(@"startdate ==%@",startdate);

  NSDateFormatter *tempFormatter1 = [[[NSDateFormatter alloc]init]autorelease];
  [tempFormatter1 setDateFormat:@"dd-MM-yyyy HH:mm:ss"];
  NSDate *toDate = [tempFormatter1 dateFromString:@"20-01-2011 09:00:00"];
  NSLog(@"toDate ==%@",toDate);

   int i = [startdate timeIntervalSince1970];
   int j = [toDate timeIntervalSince1970];

   double X = j-i;

   int days=(int)((double)X/(3600.0*24.00));
   NSLog(@"Total Days Between::%d",days);

---

Edit 1:

we can find date difference using following function :

-(int)dateDiffrenceFromDate:(NSString *)date1 second:(NSString *)date2 {
    // Manage Date Formation same for both dates
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"dd-MM-yyyy"];
    NSDate *startDate = [formatter dateFromString:date1];
    NSDate *endDate = [formatter dateFromString:date2];


    unsigned flags = NSDayCalendarUnit;
    NSDateComponents *difference = [[NSCalendar currentCalendar] components:flags fromDate:startDate toDate:endDate options:0];

    int dayDiff = [difference day];

    return dayDiff;
}

from Abizern`s ans. find more infromation for NSDateComponent here.

Answer 2

NSCalendar *Calander = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
NSDateComponents *comps = [[NSDateComponents alloc] init];

[dateFormat setDateFormat:@"dd"];
[comps setDay:[[dateFormat stringFromDate:[NSDate date]] intValue]];
[dateFormat setDateFormat:@"MM"];
[comps setMonth:[[dateFormat stringFromDate:[NSDate date]] intValue]];
[dateFormat setDateFormat:@"yyyy"];
[comps setYear:[[dateFormat stringFromDate:[NSDate date]] intValue]];
[dateFormat setDateFormat:@"HH"];
[comps setHour:05];
[dateFormat setDateFormat:@"mm"];
[comps setMinute:30];

NSDate *currentDate=[Calander dateFromComponents:comps];

NSLog(@"Current Date is :- '%@'",currentDate);


[dateFormat setDateFormat:@"dd"];
[comps setDay:[[dateFormat stringFromDate:yourDate] intValue]];
[dateFormat setDateFormat:@"MM"];
[comps setMonth:[[dateFormat stringFromDate:yourDate] intValue]];
[dateFormat setDateFormat:@"yyyy"];
[comps setYear:[[dateFormat stringFromDate:yourDate] intValue]];
[dateFormat setDateFormat:@"HH"];
[comps setHour:05];
[dateFormat setDateFormat:@"mm"];
[comps setMinute:30];

NSDate *reminderDate=[Calander dateFromComponents:comps];

    //NSLog(@"Current Date is :- '%@'",reminderDate);

    //NSLog(@"Current Date is :- '%@'",currentDate);

    NSTimeInterval ti = [reminderDate timeIntervalSinceDate:currentDate];

    //NSLog(@"Time Interval is :- '%f'",ti);
    int days = ti/86400;

[dateFormat release];
[Calander release];
[comps release];

Hope It will work for you........

Answer 3

A simpler way of doing it is:

// This just sets up the two dates you want to compare
NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setDateFormat:@"dd-MM-yyyy"];
NSDate *startDate = [formatter dateFromString:@"01-01-2011"];
NSDate *endDate = [formatter dateFromString:@"25-03-2011"];

// This performs the difference calculation
unsigned flags = NSDayCalendarUnit;
NSDateComponents *difference = [[NSCalendar currentCalendar] components:flags fromDate:startDate toDate:endDate options:0];

// This just logs your output
NSLog(@"Start Date, %@", startDate);
NSLog(@"End Date, %@", endDate);
NSLog(@"%ld", [difference day]);

And the results are:

Start Date, 2011-01-01 00:00:00 +0000

End Date, 2011-03-25 00:00:00 +0000

83

Trying to use and manipulate seconds for calculating time differences is a bad idea. There are a whole load of classes and methods provided by Cocoa for Calendrical calculations and you should use them as much as possible.

Answer 4

Try this

- (int) daysToDate:(NSDate*) endDate
{
    //dates needed to be reset to represent only yyyy-mm-dd to get correct number of days between two days.
    NSDateFormatter *temp = [[NSDateFormatter alloc] init];
    [temp setDateFormat:@"yyyy-MM-dd"];
    NSDate *stDt = [temp dateFromString:[temp stringFromDate:self]];
    NSDate *endDt =  [temp dateFromString:[temp stringFromDate:endDate]];
    [temp release]; 
    unsigned int unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *comps = [gregorian components:unitFlags fromDate:stDt  toDate:endDt  options:0];
    int days = [comps day];
    [gregorian release];
    return days;
}

Answer 5

//try it

if((![txtFromDate.text isEqualToString:@""]) && (![txtToDate.text isEqualToString:@""]))
    {
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setDateFormat:@"MM/dd/yyyy"];
        NSDate *startDate = [formatter dateFromString:txtFromDate.text];
        NSDate *endDate = [formatter dateFromString:txtToDate.text];
        unsigned flags = NSDayCalendarUnit;
        NSDateComponents *difference = [[NSCalendar currentCalendar] components:flags fromDate:startDate toDate:endDate options:0];

        int dayDiff = [difference day];

        lblNoOfDays.text =[NSString stringWithFormat:@"%d",dayDiff];
    }

Answer 6

//write this code in .h file
{
    NSDate *startDate,*EndDate;
    NSDateFormatter *Date_Formatter;
}
//write this code in .h file`enter code here`
- (void)viewDidLoad
{
    [super viewDidLoad];
    Date_Formatter =[[NSDateFormatter alloc]init];
    [Date_Formatter setDateFormat:@"dd-MM-yyyy"];

    UIToolbar *numbertoolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
    numbertoolbar.barStyle = UIBarStyleBlackTranslucent;
    numbertoolbar.items = [NSArray arrayWithObjects:[[UIBarButtonItem alloc]initWithTitle:@"Next"
    style:UIBarButtonItemStyleDone target:self action:@selector(doneWithNumberPad)],nil];
    [numbertoolbar sizeToFit];

    Txt_Start_Date.inputAccessoryView = numbertoolbar;
    [Txt_Start_Date setInputView:Picker_Date];
    Txt_End_Date.inputAccessoryView = numbertoolbar;
    [Txt_End_Date setInputView:Picker_Date];
    [Picker_Date addTarget:self action:@selector(updateTextfield:) forControlEvents:UIControlEventValueChanged];
    // Do any additional setup after loading the view, typically from a nib.
}
-(void)doneWithNumberPad
{

    if ([Txt_Start_Date isFirstResponder])
    {
        [Txt_Start_Date resignFirstResponder];
        [Txt_End_Date becomeFirstResponder];
    }
    else if([Txt_End_Date isFirstResponder])
    {
        [Txt_End_Date resignFirstResponder];

        startDate =[Date_Formatter dateFromString:Txt_Start_Date.text];
        EndDate =[Date_Formatter dateFromString:Txt_End_Date.text];
        NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
        NSDateComponents *components = [calendar components:NSDayCalendarUnit fromDate:startDate toDate:EndDate options:0];
        Lab_Total_Days.text =[NSString stringWithFormat:@"%ld",components.day];
    }

}

Answer 7

to find the number of dates between start date to end date.

 NSCalendar *cale=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
    unsigned unitFlags=NSMonthCalendarUnit| NSDayCalendarUnit;
    NSDateComponents *comp1=[cale components:unitFlags fromDate:startDate toDate:endDate options:0];

    NSInteger days=[comp1 day];
    NSLog(@"Days %ld",(long)days);