查找 iPhone 中两个日期之间的总天数

Question

我想查找两个日期之间的总天数。

例如，今天是 01-01-2011(DD-MM-YYYY)，第二个日期是 (25-03-2011)，我如何找到总天数？

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

在您的日期格式中，您设置错误，它是 dd-MM-yyyy HH:mm:ss 。可能这就是问题所在..你得到了错误的日期并且没有得到答案我发送了一些代码来获取日期差异。

  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);

---

编辑1：

我们可以使用以下函数找到日期差异：

-(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;
}

来自 Abizern 的 ans。查找 NSDateComponent 的更多信息 <强>这里。

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];

希望它对你有用......

Answer 3

更简单的方法是：

// 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]);

结果是：

开始日期，2011-01-01 00:00:00 +0000

结束日期，2011-03-25 00:00:00 +0000

83

尝试使用和操作秒来计算时间差是一个坏主意。 Cocoa 提供了大量用于日历计算的类和方法，您应该尽可能多地使用它们。

Answer 4

试试这个

- (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

//尝试一下

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

查找开始日期到结束日期之间的日期数。

 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);

Answer 7

NSDate *dateA;
NSDate *dateB;

NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit
                                           fromDate:dateA
                                             toDate:dateB
                                            options:0];

NSLog(@"Difference in date components: %i/%i/%i", components.day, components.month, components.year);

Answer 8

//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 9

请尝试这个。希望它能帮助你...

NSDateFormatter *df=[[NSDateFormatter alloc] init];
// Set the date format according to your needs
[df setDateFormat:@"MM/dd/YYYY hh:mm a"]; //for 12 hour format
//[df setDateFormat:@"MM/dd/YYYY HH:mm "]  // for 24 hour format
NSDate *date1 = [df dateFromString:firstDateString];
NSDate *date2 = [df dateFromString:secondDatestring];
NSLog(@"%@f is the time difference",[date2 timeIntervalSinceDate:date1]);
[df release];