在iPhone上查找两个日期之间的总天数

Question

我想要找到两个日期之间的总天数。

例如，今天是2011年1月1日（DD-MM-YYYY），第二个日期是（25-03-2011），我该如何找到总天数？

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);

- KETAN

---

可能是重复问题：如何在Objective-C中获取两个日期之间的天数。 - holex

可能是一个重复的问题，如何比较两个日期并返回天数 - Jon Reid

Answer 1

你的日期格式设置错误了，应该是 dd-MM-yyyy HH:mm:ss。也许这就是问题所在。你会得到错误的日期，并且无法得到正确的答案。我发送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：

-(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的回答。在这里可以找到更多有关NSDateComponent的信息。

- AJPatel

---

请注意，这并没有考虑小时的变化。例如，如果差距为1.6天，则可能返回1天而不是2天，在两个日期之间发生夏令时切换的情况下可能会更糟。建议使用NSDateComponents获取日期组件，例如天、月、年等。 - AliSoftware

好的，但是您可以轻松理解这个简单的逻辑。任何人在获得想法后都可以编写代码。 - AJPatel

@AJPatel，我该如何获取日期范围内的记录？例如：从2016年12月9日00:00:00到2016年12月9日23:59:59。 - Krutarth Patel

@KrutarthPatel 在你的集合上使用谓词筛选器。类似于“@”dateField > %@ AND dateField <= “%@”，startDate,endDate”。 - AJPatel

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];

希望这对你有用……

- SJS

---

抱歉，我无法理解您的日期，并尝试了另一个日期，但它会给出-145天的差异，这是不正确的。 - KETAN

Answer 3

更简单的做法是：

// 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]);

以下是结果:

开始日期，2011年01月01日 00:00:00 +0000

结束日期，2011年03月25日 00:00:00 +0000

83

尝试使用秒来计算时间差是一个不好的想法。Cocoa提供了许多类和方法用于日历计算，您应尽可能使用它们。

- Abizern

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;
}

- Chetan Bhalara

---

在使用精确时间时，我得到了错误的时间日历天数差。这是正确的解决方案！太好了！ - Nikolay Frick

谢谢nfrik。你能帮我其他的事吗？ - Chetan Bhalara

你应该明确指出这是从Joshua Weinberg的答案复制过来的，链接在这里：https://dev59.com/RU7Sa4cB1Zd3GeqP4Ypv#3142380 - Brad Larson

Answer 5

查找从开始日期到结束日期之间的日期数量。

 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);

- MAHBOOB

Answer 6

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);

- IOS_DEVELOPER

Answer 7

//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];
    }

}

- IOS_DEVELOPER

Answer 8

//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];
    }

- user3091160

Answer 9

请尝试这个。希望能对你有所帮助...

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];

- Mitesh Khatri