发现日期从数组日期 [英] finding out days remain from array of dates

问题描述

我有一个像下面的数组

  _combinedBirthdates（
03/12/2013​​，
03/12/2013​​，
08/13/1990，
12/09/1989，
02/06，
09 / 08，
03/02/1990，
08/22/1989，
03/02，
05/13，
10/16，
07/08，
08/31/1990，
04/14/1992，
12/15 / 1905，
08/14/1989，
10/07/1987，
07/25，
07/17/1989 
03/24/1987，
07/28/1988，
01/21/1990，
10/13
  
 
 
 
）
 
 
 
这些都是NSString 
 
 
 
我试图创建一个新的数组，其中包含如下所示的日子
 
 
 
（特定出生日期剩余天数）
（我们将比较当前日期与上述日期数组，我们将找出剩余日期）
 _newarray（
125，
100，
65 b $ b and until end like this .. 
）
 
 
 
我使用下面的代码
  unsigned int unitFlags = NSDayCalendarUnit; 
 NSCalendar * currCalendar = [[NSCalendar alloc] 
 initWithCalendarIdentifier：NSGregorianCalendar]; 
 
 
 NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; 
 
 [dateFormatter setDateStyle：NSDateFormatterShortStyle]; 
 NSLog（@currCalendar％@，currCalendar）; 
 
 NSMutableArray * _newarray = [[NSMutableArray alloc] init]; 
 for（NSString * str in _combinedBirthdates）{
 
 NSDate * toDate = [dateFormatter dateFromString：str]; 
 NSDateComponents * daysInfo = [currCalendar components：unitFlags fromDate：[NSDate date] toDate：toDate options：0]; 
 int days = [daysInfo day]; 
 [_newarray addObject：[NSString stringWithFormat：@％d，days]]; 
} 
 NSLog（@_newarray％@，_ newarray）; 
  
这是我得到的输出当我打印_newarray plz帮助我谢谢
  _newlymadeArray（
-1，
-1，
-8248 
-8495，
-4454，
-4454，
-8412，
-8604，
 -4454，
-4454，
-4454，
-4454，
-8230，
-7638 b $ b-39170，
-8612，
-9289，
-4454，
-8640，
 9486，
-8994，
-8452，
-4454，
-2072，
-888 $ b-8315
）
  
 
 
解决方案
请尝试使用这个。我认为这可以帮助你。
  NSDateFormatter * tempFormatter = [[NSDateFormatter alloc] init]; 
 [tempFormatter setDateFormat：@dd / MM / yyyy]; 
 
 NSString * str = [tempFormatter stringFromDate：@yourStartDate]; 
 NSDate * startdate = [tempFormatter dateFromString：str]; 
 
 str = [tempFormatter stringFromDate：@yourEndDate]; 
 NSDate * endDate = [tempFormatter dateFromString：str]; 
 
 int i = [startdate timeIntervalSince1970]; 
 int j = [toDate timeIntervalSince1970]; 
 
 double X = j-i; 
 
 int days =（int）（double）X /（3600.0 * 24.00））; 
  
 
i have one array something like below 
_combinedBirthdates(
"03/12/2013",
"03/12/2013",
"08/13/1990",
"12/09/1989",
"02/06",
"09/08",
"03/02/1990",
"08/22/1989",
"03/02",
"05/13",
"10/16",
"07/08",
"08/31/1990",
"04/14/1992",
"12/15/1905",
"08/14/1989",
"10/07/1987",
"07/25",
"07/17/1989",
"03/24/1987",
"07/28/1988",
"01/21/1990",
"10/13"
)

this all are NSString

i am trying to make new array from this which contains days remaining something like below 

(days remaining for particular birthdate)
(we will compair current date with above date array and we will find out remaining days)
      _newarray(
       "125",
       "100",
       "65",
       and till end like this..
       )

i am using below code for this 
unsigned int unitFlags =  NSDayCalendarUnit;
NSCalendar *currCalendar = [[NSCalendar alloc]
                            initWithCalendarIdentifier:NSGregorianCalendar];


NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateStyle:NSDateFormatterShortStyle];
NSLog(@" currCalendar%@",currCalendar);

NSMutableArray * _newarray = [[NSMutableArray alloc] init];
for (NSString * str in _combinedBirthdates){

    NSDate * toDate = [dateFormatter dateFromString:str];
    NSDateComponents *daysInfo = [currCalendar components:unitFlags fromDate:[NSDate date]  toDate:toDate  options:0];
    int days = [daysInfo day];
    [_newarray addObject:[NSString stringWithFormat:@"%d",days]];
}
NSLog(@" _newarray%@",_newarray);
and this is what i am getting as output when i print _newarray plz help me thank you
_newlymadeArray(
"-1",
"-1",
"-8248",
"-8495",
"-4454",
"-4454",
"-8412",
"-8604",
"-4454",
"-4454",
"-4454",
"-4454",
"-8230",
"-7638",
"-39170",
"-8612",
"-9289",
"-4454",
"-8640",
"-9486",
"-8994",
"-8452",
"-4454",
"-2072",
"-888",
"-8315"
)

解决方案
Please try to use this.I think this one may help you.
NSDateFormatter *tempFormatter = [[NSDateFormatter alloc]init];
    [tempFormatter setDateFormat:@"dd/MM/yyyy"];

    NSString *str = [tempFormatter stringFromDate:@"yourStartDate"];
    NSDate *startdate = [tempFormatter dateFromString:str];

    str = [tempFormatter stringFromDate:@"yourEndDate"];
    NSDate *endDate = [tempFormatter dateFromString:str];

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

    double X = j-i;

    int days=(int)((double)X/(3600.0*24.00));


                        
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