This is my code and it perfectly returns number of days and months between two dates. i want to validate this like the difference between two dates should be exactly one year.like if u select july 29 2013 as start date and july 30 2014 as end date it should not be allowed to execute more.please help thanks in advance.
NSString *sta = txtStartdate.text; // This is the start date
NSString *en = txtEnddate.text; //this is end date
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:#"dd/MM/yyyy"];
NSDate *startDat = [f dateFromString:sta];
NSDate *endDat = [f dateFromString:en];
[f release];
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit | NSYearCalendarUnit ;
NSDateComponents *components = [gregorian components:unitFlags
fromDate:startDat
toDate:endDat options:0];
NSInteger months = [components month];
NSInteger days = [components day];
NSInteger years = [components year];
NSLog(#"Number of months %d",months);
NSLog(#"Number of days %d",days);
NSLog(#"Number of years %d",years);
[gregorian release];
if(years < 1 )// This code works fine...i've edited it.. #wain helped
{
//
}
Add NSYearCalendarUnit to unitFlags, then when you have obtained the components you can request the year. This will deal with leap years better than you trying to count months and days or calculate the end date (unless you use the components to add a single year to the date to get the end date).
How do I get date from the day of the year?
for e.g., if I give day as "1" then date should be "January 1"
How do I get that in iPhone? I have found answer in javascript but I want to know how to do the achieve same thing in Objective?
I guess this code will work for you:
I have created a sample function where a textfield gives input values for how many days to add. And a button to calculate final day. Here is the button event logic.
NSDateComponents *dateComponent = [[NSDateComponents alloc] init];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"yyyy-mm-dd"];
NSDate *newDate = [formatter dateFromString:#"2012-01-01"];
// add days to current date
dateComponent.day = [dayTextField.text intValue];
// get a new date by adding components
newDate = [[NSCalendar currentCalendar] dateByAddingComponents: dateComponent toDate:newDate options:0];
[finalDate setText:[NSString stringWithFormat:#"%#", newDate]];
Here dayTextField.text is the text which says how many number of days want to calculated. (For example 125 days) and finalDate is an label which displays final generated date (means date after 125 days since 1 Jan 2012).
Benefit of this code is, any time you can change the start day parameter. For example, for other requirement, i need to count my days from "31 May 1999" then i will change it easily in one line and the same code will work.
Enjoy Coding :)
NSCalendar *gregorian =
[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSUInteger dayOfYear =
[gregorian ordinalityOfUnit:NSDayCalendarUnit
inUnit:NSYearCalendarUnit forDate:[NSDate date]];
[gregorian release];
return dayOfYear;
Take from the post:
How do you calculate the day of the year for a specific date in Objective-C?
I need to make a calendar in which the user can scroll between several weeks. The first and last day of the week will be displayed like (e.g.) "June 4 - June 10".
Now I knew from the beginning that I'd need NSDate and NSCalendar, and indeed I managed to get the first and last day of just thist week, but it looks extremely cumbersome and I am sure there needs to be an easier method, as I need to get the dates for several more coming and past weeks.
This is my code which gives the day and month of the first and last day of the current week:
NSDate *today = [NSDate date];
NSCalendar* cal = [NSCalendar currentCalendar];
NSDateComponents* comp = [cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSYearCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit) fromDate:[NSDate date]];
NSDate *beginOfWeek = [today dateByAddingTimeInterval: -1*([comp weekday]-2)*24*3600];
NSDate *endOfWeek = [today dateByAddingTimeInterval:(7-[comp weekday]+2)*24*3600];
NSLog(#"beginWeekDay=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: beginOfWeek] day]);
NSLog(#"endWeekDay=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: endOfWeek] day]);
NSLog(#"beginWeekmonth=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: beginOfWeek] month]);
NSLog(#"endWeekmonth=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: endOfWeek] month]);
I found this, which may be helpful to you: http://www.cocoanetics.com/2009/11/add-one-week-skip-weekend/
- (NSDate *)addWeekToDateAndSkipWeekend:(NSDate *)now {
int daysToAdd = 6; // we'll add the 7th later
// set up date components
NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
[components setDay:daysToAdd];
// create a calendar
NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDate *newDate = [gregorian dateByAddingComponents:components toDate:now options:0];
[components setDay:1]; // reuse to skip single days
NSDateComponents *newDateComps; // new componets to get weekday
// do always executed once, so we add the 7th day here
do
{
// add one day
newDate = [gregorian dateByAddingComponents:components toDate:newDate options:0];
newDateComps = [gregorian components:NSWeekdayCalendarUnit fromDate:newDate];
// repeat if the date is Saturday (7) or Sunday (1)
NSLog(#"weekday: %d", [newDateComps weekday]);
} while (([newDateComps weekday]==7)||([newDateComps weekday]==1));
return newDate;
}
Theoretically, you run this in a for loop with [NSDate date] and you will get the 7th day returned, you would then run the returned 7th day through this and get the next..etc..
May need minor alteration, to remove the check for Saturday+Sunday if you don't need it.
Hope this helps !
Basically I want to know I a user chooses from my settings what day they want a week to start on (This would have a value in the format, #"Mon" for example) and I have an NSMutableArray that holds NSDates (users add theses dates throughout the life of the app) ordered in a chronologically ascending manner, but not necessarily consecutive (there could be day's that users missed and did not add the date to the array), how could I determine that a particular NSDate in the array is part of a different week (relative to the date the user chose for a week to start on)?
This will give you the difference between two dates in weeks:
NSDateComponents *dateDifference = [gregorian components:NSWeekCalendarUnit fromDate:day1 toDate:day2 options:0];
NSUInteger weeksDiff = [dateDifference week];
So if(!weekDiff){ /*same week*/}
Complete example:
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps1 = [[NSDateComponents alloc] init];
NSDateComponents *comps2 = [[NSDateComponents alloc] init];
[comps1 setDay:5];
[comps2 setDay:12];
NSDate *day1 = [gregorian dateByAddingComponents:comps1 toDate:[NSDate date] options:0];
NSDate *day2 = [gregorian dateByAddingComponents:comps2 toDate:[NSDate date] options:0];
NSDateComponents *dateDifference = [gregorian components:NSWeekCalendarUnit fromDate:day1 toDate:day2 options:0];
NSLog(#"\n%# \n%#\n%d", day1, day2, [dateDifference week]);
[comps1 release];
[comps2 release];
[gregorian release];
For converting strings to NSDates, see NSDateFormatter
edit as response to comment
if you want to have a week that starts with the first date you pass in, you could instead count the days and check if they have more than 7 days difference.
NSDateComponents *dateDifference = [gregorian components:NSDayCalendarUnit fromDate:day1 toDate:day2 options:0];
NSUInteger daysDiff = [dateDifference day];
if(weekDiff < 7){ /*same week*/}
Use NSDateComponents. You can get them from date with NSCalendar instance.
I'm writing a GTD app for the iPhone. For the due tasks, I want to display something like "Due tomorrow" or "Due yesterday" or "Due July 18th". Obviously, I need to display "Tomorrow" even if the task is less than 24 hours away (e.g. the user checks at 11pm on Saturday and sees there's a task on Sunday at 8am). So, I wrote a method to get the number of days in between two dates. Here's the code...
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy-MM-dd-HH-mm"];
NSDate *nowDate = [dateFormatter dateFromString:#"2010-01-01-15-00"];
NSDate *dueDate = [dateFormatter dateFromString:#"2010-01-02-14-00"];
NSLog(#"NSDate *nowDate = %#", nowDate);
NSLog(#"NSDate *dueDate = %#", dueDate);
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *differenceComponents = [calendar components:(NSDayCalendarUnit)
fromDate:nowDate
toDate:dueDate
options:0];
NSLog(#"Days between dates: %d", [differenceComponents day]);
... and here's the output:
NSDate *nowDate = 2010-01-01 15:00:00 -0700
NSDate *dueDate = 2010-01-02 14:00:00 -0700
Days between dates: 0
As you can see, the method returns incorrect results. It should have returned 1 as the number of days between the two days. What am I doing wrong here?
EDIT: I wrote another method. I haven't done extensive unit tests, but so far it seems to work:
+ (NSInteger)daysFromDate:(NSDate *)fromDate inTimeZone:(NSTimeZone *)fromTimeZone untilDate:(NSDate *)toDate inTimeZone:(NSTimeZone *)toTimeZone {
NSCalendar *calendar = [NSCalendar currentCalendar];
unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
[calendar setTimeZone:fromTimeZone];
NSDateComponents *fromDateComponents = [calendar components:unitFlags fromDate:fromDate];
[calendar setTimeZone:toTimeZone];
NSDateComponents *toDateComponents = [calendar components:unitFlags fromDate:toDate];
[calendar setTimeZone:[NSTimeZone defaultTimeZone]];
NSDate *adjustedFromDate = [calendar dateFromComponents:fromDateComponents];
NSDate *adjustedToDate = [calendar dateFromComponents:toDateComponents];
NSTimeInterval timeIntervalBetweenDates = [adjustedToDate timeIntervalSinceDate:adjustedFromDate];
NSInteger daysBetweenDates = (NSInteger)(timeIntervalBetweenDates / (60.0 * 60.0 * 24.0));
NSDateComponents *midnightBeforeFromDateComponents = [[NSDateComponents alloc] init];
[midnightBeforeFromDateComponents setYear:[fromDateComponents year]];
[midnightBeforeFromDateComponents setMonth:[fromDateComponents month]];
[midnightBeforeFromDateComponents setDay:[fromDateComponents day]];
NSDate *midnightBeforeFromDate = [calendar dateFromComponents:midnightBeforeFromDateComponents];
[midnightBeforeFromDateComponents release];
NSDate *midnightAfterFromDate = [[NSDate alloc] initWithTimeInterval:(60.0 * 60.0 * 24.0)
sinceDate:midnightBeforeFromDate];
NSTimeInterval timeIntervalBetweenToDateAndMidnightBeforeFromDate = [adjustedToDate timeIntervalSinceDate:midnightBeforeFromDate];
NSTimeInterval timeIntervalBetweenToDateAndMidnightAfterFromDate = [adjustedToDate timeIntervalSinceDate:midnightAfterFromDate];
if (timeIntervalBetweenToDateAndMidnightBeforeFromDate < 0.0) {
// toDate is before the midnight before fromDate
timeIntervalBetweenToDateAndMidnightBeforeFromDate -= daysBetweenDates * 60.0 * 60.0 * 24.0;
if (timeIntervalBetweenToDateAndMidnightBeforeFromDate < 0.0)
daysBetweenDates -= 1;
}
else if (timeIntervalBetweenToDateAndMidnightAfterFromDate >= 0.0) {
// toDate is after the midnight after fromDate
timeIntervalBetweenToDateAndMidnightAfterFromDate -= daysBetweenDates * 60.0 * 60.0 * 24.0;
if (timeIntervalBetweenToDateAndMidnightAfterFromDate >= 0.0)
daysBetweenDates += 1;
}
[midnightAfterFromDate release];
return daysBetweenDates;
}
From the docs for components:fromDate:toDate:options::
The result is lossy if there is not a small enough unit requested to hold the full precision of the difference.
Since the difference is less than a full day, it correctly returns a result of 0 days.
If all you care about is tomorrow or yesterday vs. a specific date, then you can save yourself a lot of work and just test whether the dates are only one calendar day apart.
To do that, compare the dates to find which is earlier and which is later (and if they compare equal, bail out with that result), then test whether 1 day after the earlier date produces a date with the same year, month, and day-of-month as the later date.
If you really do want to know exactly how many calendar days there are from one date to the other:
Send the calendar a components:fromDate: message to get the year, month, and day-of-the-month of the first date.
Same as #1, but for the second date.
If the two dates are in the same year and month, subtract one day-of-month from the other and pass to abs (see abs(3)) to take the absolute value.
If they are not in the same year and month, test whether they are in adjacent months (e.g., December 2010 to January 2011, or June 2010 to July 2010). If they are, add the number of days in the earlier date's month (which you can obtain by sending the calendar a rangeOfUnit:inUnit:forDate: message, passing NSDayCalendarUnit and NSMonthCalendarUnit, respectively) to the day-of-month of the later date, then compare that result to the earlier date's day-of-month.
For example, when comparing 2010-12-31 to 2011-01-01, you would first determine that these are in adjacent months, then add 31 (number of days in 2010-12) to 1 (day-of-month of 2011-01-01), then subtract 31 (day-of-month of 2010-12-31) from that sum. Since the difference is 1, the earlier date is one day before the later date.
When comparing 2010-12-30 to 2011-01-02, you would determine that they are in adjacent months, then add 31 (days in 2010-12) to 2 (day-of-month of 2011-01-02), then subtract 30 (day-of-month of 2010-12-30) from that sum. 33 minus 30 is 3, so these dates are three calendar days apart.
Either way, I strongly suggest writing unit tests at least for this code. I've found that date-handling code is among the most likely to have subtle bugs that only manifest, say, twice a year.
One thing you might try is using rangeOfUnit: to zero out hours, minutes and seconds from the start and end dates.
NSCalendar *calendar = [NSCalendar currentCalendar];
NSCalendarUnit range = NSDayCalendarUnit;
NSDateComponents *comps = [[NSDateComponents alloc] init];
NSDate *start = [NSDate date];
NSDate *end;
[comps setDay:1];
[calendar rangeOfUnit:range startDate:&start interval:nil forDate:start];
end = [calendar dateByAddingComponents:comps toDate:start options:0];
In this example start will be 2010-06-19 00:00:00 -0400, end will be 2010-06-20 00:00:00 -0400. I'd imagine this would work better with NSCalendar's comparison methods, although I haven't tested it myself.
I am using this piece of code, it is working very well:
- (NSInteger)daysToDate:(NSDate*)date
{
if(date == nil) {
return NSNotFound;
}
NSUInteger otherDay = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitEra forDate:date];
NSUInteger currentDay = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitEra forDate:self];
return (otherDay-currentDay);
}
Here is the function I've used in the past
its defined in a category on NSDate
- (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;
}
-(NSInteger)daysBetweenTwoDates:(NSDate*)fromDateTime andDate:(NSDate*)toDateTime
{
NSDate *fromDate;
NSDate *toDate;
NSCalendar *calendar = [NSCalendar currentCalendar];
[calendar rangeOfUnit:NSDayCalendarUnit startDate:&fromDate
interval:NULL forDate:fromDateTime];
[calendar rangeOfUnit:NSDayCalendarUnit startDate:&toDate
interval:NULL forDate:toDateTime];
NSDateComponents *difference = [calendar components:NSDayCalendarUnit
fromDate:fromDate toDate:toDate options:0];
return [difference day];
}