我想找出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)，我怎样才能找到总天数？
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);
【问题讨论】：
标签： ios nsdate nsdateformatter
在您设置错误的日期格式中，它是 dd-MM-yyyy HH:mm:ss 。可能这就是问题所在..你得到错误的日期并且没有得到答案我发送litte bit code来获取日差。
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 的回答。查找更多关于 NSDateComponent 的信息here.
【讨论】：
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........
【讨论】：
一个更简单的方法是：
// 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
尝试使用和操纵秒来计算时差是一个坏主意。 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。
【讨论】：
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;
}
【讨论】：
//试试看
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];
}
【讨论】：
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);
【讨论】：
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);
【讨论】：
//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];
}
}
【讨论】：
请试试这个。希望对你有帮助...
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];
【讨论】：