I have this category added to NSDate:
- (bool)isWeekend
{
NSString* s = [self asString:#"e"];
if ([s isEqual:#"6"])
return YES;
else if ([s isEqual:#"7"])
return YES;
else
return NO;
}
Helper function:
- (NSString*)asString:(NSString*)format
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:format];
NSString *formattedDateString = [dateFormatter stringFromDate:self];
[dateFormatter release];
return formattedDateString;
}
isWeekend should return YES if it is a saturday or a sunday. But it does not work if the locale has a week start on a sunday, in which case friday will be day 6 and saturday will be day 7.
How can I solve this?
You want to use NSCalendar and NSDateComponents:
NSDate *aDate = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSRange weekdayRange = [calendar maximumRangeOfUnit:NSWeekdayCalendarUnit];
NSDateComponents *components = [calendar components:NSWeekdayCalendarUnit fromDate:aDate];
NSUInteger weekdayOfDate = [components weekday];
if (weekdayOfDate == weekdayRange.location || weekdayOfDate == weekdayRange.length) {
//the date falls somewhere on the first or last days of the week
NSLog(#"weekend!");
}
This is operating under the assumption that the first and last days of the week comprise the "week ends" (which is true for the Gregorian calendar. It may not be true in other calendars).
As of iOS 8, you can use isDateOnWeekend: on NSCalendar.
In Swift 3+:
extension Date {
var isWeekend: Bool {
return NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)!.isDateInWeekend(self)
}
}
In Swift:
func isWeekend(date: NSDate) -> Bool {
let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
return calendar.isDateInWeekend(date)
}
Related
I tried the following code, but I do not get a condition where the date is in next week. How will I know that the date which is parameter in the function falls in next week? Following code always returns 1.
- (NSInteger)thisW:(NSDate *)date
{
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *todaysComponents =
[gregorian components:NSYearCalendarUnit fromDate:[NSDate date]];
NSUInteger todaysWeek = [todaysComponents weekOfYear];
NSDateComponents *otherComponents =
[gregorian components:NSYearCalendarUnit fromDate:date];
NSUInteger datesWeek = [otherComponents weekOfYear];
//NSLog(#"Date %#",date);
if(todaysWeek==datesWeek){
//NSLog(#"Date is in this week");
return 1;
}else if(todaysWeek+1==datesWeek){
//NSLog(#"Date is in next week");
return 2;
} else {
return 0;
}
}
You need to pass NSCalendarUnitWeekOfYear when extracting date components:
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *todaysComponents = [gregorian components:NSCalendarUnitWeekOfYear fromDate:[NSDate date]];
NSUInteger todaysWeek = [todaysComponents weekOfYear];
NSDateComponents *otherComponents = [gregorian NSCalendarUnitWeekOfYear fromDate:date];
NSUInteger datesWeek = [otherComponents weekOfYear];
Using datecomponents for week calculations will give you problems when the dates are close to year's end, i.e. "The first week of the year is designated to be the week containing the first Thursday of the year.(ISO 8601)"
I find it easier to compare dates with certain granularity, weekly in this case (the following code detects if a date is more than one week in the past, last week, this week, next week or further in the future)
-(EventWeekRange)numberOfWeeksFromTodayToEvent:(NSDate *)eventDate {
NSCalendar *calendar = [NSCalendar currentCalendar];
NSComparisonResult comparison = [calendar compareDate:[NSDate date] toDate:eventDate toUnitGranularity:NSCalendarUnitWeekOfYear];
if (comparison == NSOrderedSame) {
return RangeThisWeek;
} else if (comparison == NSOrderedAscending) { // The event date is in the future
// Advance today's date one week to check if this new date is in the same week as the event
NSDate *todaysNextWeek = [[NSDate date]dateByAddingTimeInterval:60*60*24*7];
if ([calendar compareDate:todaysNextWeek toDate:eventDate toUnitGranularity:NSCalendarUnitWeekOfYear] == NSOrderedSame) {
return RangeNextWeek;
} else {
return RangeLater;
}
} else { // The event date is in the past
// Advance the event's date one week to check if this new date is in the same week as today
NSDate *eventsNextWeek = [eventDate dateByAddingTimeInterval:60*60*24*7];
if ([calendar compareDate:eventsNextWeek toDate:[NSDate date] toUnitGranularity:NSCalendarUnitWeekOfYear] == NSOrderedSame) {
return RangeLastWeek;
} else {
return RangeEarlier;
}
}
}
I've read all the questions and answer and all the tutorial about this subject, but for some reason it's not working for me. always showing me that the two dates are the same date!
Please some one help me to figure it out, I just want to check if one is bigger than the other (including date and time - without seconds) or if they are equal.
This is my code:
- (BOOL)isEndDateIsBiggerThanCurrectDate:(NSDate *)checkEndDate
{
NSString *endd = [NSDateFormatter localizedStringFromDate:checkEndDate
dateStyle:NSDateFormatterShortStyle
timeStyle:NSDateFormatterShortStyle];
NSString *curreeeent = [NSDateFormatter localizedStringFromDate:[NSDate date]
dateStyle:NSDateFormatterShortStyle
timeStyle:NSDateFormatterShortStyle];
NSDateFormatter * df = [[NSDateFormatter alloc]init];;
NSDate * newCurrent = [df dateFromString:endd];
NSDate * newEnd = [df dateFromString:curreeeent];
switch ([newCurrent compare:newEnd])
{
case NSOrderedAscending:
return YES;
break;
case NSOrderedSame:
return NO;
break;
case NSOrderedDescending:
return NO;
break;
}
}
Thank you very much!
For this, you have to use NSCalender.
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger desiredComponents = (NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit);
NSDateComponents *firstComponents = [calendar components:desiredComponents fromDate:[NSDate date]];
NSDateComponents *secondComponents = [calendar components:desiredComponents fromDate: checkEndDate];
NSDate *first = [calendar dateFromComponents:firstComponents];
NSDate *second = [calendar dateFromComponents:secondComponents];
NSComparisonResult result = [first compare:second];
if (result == NSOrderedAscending) {
//checkEndDate is before now
} else if (result == NSOrderedDescending) {
//checkEndDate is after now
} else {
//both are same
}
You should really be using time intervals rather than converting between dates and strings.
Something like the following should suit your needs:
//current time
NSDate *now = [NSDate date];
//time in the future
NSDate *distantFuture = [NSDate distantFuture];
//gather time interval
if([now timeIntervalSinceDate:distantFuture] > 0)
{
//huzzah!
}
I've got the answer, just checking the exact time between two dates and compare it.
- (BOOL)isEndDateIsSmallerThanCurrent:(NSDate *)checkEndDate
{
NSDate* enddate = checkEndDate;
NSDate* currentdate = [NSDate date];
NSTimeInterval distanceBetweenDates = [enddate timeIntervalSinceDate:currentdate];
double secondsInMinute = 60;
NSInteger secondsBetweenDates = distanceBetweenDates / secondsInMinute;
if (secondsBetweenDates == 0)
return YES;
else if (secondsBetweenDates < 0)
return YES;
else
return NO;
}
Why don't you change the dates into time interval since 1970 and sort by that. Extremely simple number compare, much quicker than string compare, and they will always sort correct, not like 1,10,11,2,21,22,3,....
NSDate *now = [NSDate date];
NSTimeInterval ti = [now timeIntervalSince1970];
Thats it. No new object creations, much quicker and much less taxing on the cpu.
See here how you get rid of seconds, but it is easy because you have numbers, for seconds. See here How to set seconds to zero for NSDate
I'm trying get only the Saturdays and Sundays between two dates, but I don't know why get me free days on a week.
Here is my code:
- (BOOL)checkForWeekend:(NSDate *)aDate {
BOOL isWeekendDate = NO;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSRange weekdayRange = [calendar maximumRangeOfUnit:NSWeekdayCalendarUnit];
NSDateComponents *components = [calendar components:NSWeekdayCalendarUnit fromDate:aDate];
NSUInteger weekdayOfDate = [components weekday];
if (weekdayOfDate == weekdayRange.location || weekdayOfDate == weekdayRange.length) {
// The date falls somewhere on the first or last days of the week.
isWeekendDate = YES;
}
return isWeekendDate;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
NSString *strDateIni = [NSString stringWithString:#"28-01-2012"];
NSString *strDateEnd = [NSString stringWithString:#"31-01-2012"];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"dd-MM-yyyy"];
NSDate *startDate = [df dateFromString:strDateIni];
NSDate *endDate = [df dateFromString:strDateEnd];
unsigned int unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps = [gregorian components:unitFlags fromDate:startDate toDate:endDate options:0];
// int months = [comps month];
int days = [comps day];
for (int i=0; i<days; i++)
{
NSTimeInterval interval = i;
NSDate * futureDate = [startDate dateByAddingTimeInterval:interval];
BOOL isWeekend = [self checkForWeekend:futureDate]; // Any date can be passed here.
if (isWeekend) {
NSLog(#"Weekend date! Yay!");
}
else
{
NSLog(#"Not is Weekend");
}
}
}
The problem:
The issue was caused by NSTimeInterval interval = i; The logic of the for loop was to iterate by days. Setting the time interval to i was iterating by seconds.
From documentation on NSTimeInterval
NSTimeInterval is always specified in seconds;
The answer:
Changing the NSTimeInterval line to
NSTimeInterval interval = i*24*60*60;
Here is a link to another answer I posted on SO (shameless, I know). It has some code that may help you with dates in the future. The methods are implemented as categories of NSDate, meaning they become methods of NSDate.
There are several functions there that help with weekends. But these two might be most helpful:
- (NSDate*) theFollowingWeekend;
- (NSDate *) thePreviousWeekend;
They return the date of the weekend following and prior to the receiver (self).
Generally, you should not use the notion that a day is 86400 seconds, and should use NSDateComponents and NSCalendar. This works even when daylight savings time transitions occur between dates. Like this:
- (NSDate *) dateByAddingDays:(NSInteger) numberOfDays {
NSDateComponents *dayComponent = [[NSDateComponents alloc] init];
dayComponent.day = numberOfDays;
NSCalendar *theCalendar = [NSCalendar currentCalendar];
return [theCalendar dateByAddingComponents:dayComponent toDate:self options:0];
}
One very important thing to remember is that one day is not (necessarily) equal to 24*60*60 seconds. And you should not do date arithmetic yourself
What you really need to do might seem a little tedious but this is the correct thing to do: use NSCalendar and – dateByAddingComponents:toDate:options:
See Calendrical Calculations guide.
I want to compare two dates: date1 and date2
2011-06-06 12:59:48.994 Project[419:707] firstDate:2011-06-06 10:59:21 +0000
2011-06-06 12:59:49.004 Project[419:707] selectedData:2011-06-06 10:59:17 +0000
but these dates have different time and when I use NSOrderedSame it don't work fine, how can I solve?
my code:
NSDate *firstDate = [[appDelegate.project objectAtIndex:i]objectAtIndex:3];
NSDate *secondDate = [[appDelegate.project objectAtIndex:i]objectAtIndex:4];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger comps = (NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit);
NSDateComponents *date1Components = [calendar components:comps
fromDate:firstDate];
NSDateComponents *date2Components = [calendar components:comps
fromDate:secondDate];
NSDateComponents *date3Components = [calendar components:comps fromDate:appDelegate.selectedDate];
NSLog(#"firstDate:%#", [date1Components date]);
NSLog(#"secondDate:%#", [date2Components date]);
NSLog(#"selectedData:%#", [date3Components date]);
NSComparisonResult compareStart = [[date1Components date] compare: [date3Components date]];
NSComparisonResult compareEnd = [[date2Components date] compare: [date3Components date]];
if ((compareStart == NSOrderedAscending || compareStart == NSOrderedSame)
&& (compareEnd == NSOrderedDescending || compareEnd == NSOrderedSame))
{
NSLog(#"inside");
Then I want to compare my dates and entry inside the "if" when date1 <= selectedDate <= date2; now I understand because I have a warning: I should add this "[date1Components date]" and it work; the problem is that I have in the NSLog null values, why??
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger comps = (NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear);
NSDateComponents *date1Components = [calendar components:comps
fromDate: date1];
NSDateComponents *date2Components = [calendar components:comps
fromDate: date2];
date1 = [calendar dateFromComponents:date1Components];
date2 = [calendar dateFromComponents:date2Components];
NSComparisonResult result = [date1 compare:date2];
if (result == NSOrderedAscending) {
} else if (result == NSOrderedDescending) {
} else {
//the same
}
There is another handy method to create for a given date the date that represents the start of a given unit: [aCalendar rangeOfUnit:startDate:interval:forDate:]
To illustrate how this method works, see this code, that easily creates the date for the beginning of the day, week, month and year for a given date (here: now).
NSDate *now = [NSDate date];
NSDate *startOfToday = nil;
NSDate *startOfThisWeek = nil;
NSDate *startOfThisMonth = nil;
NSDate *startOfThisYear = nil;
[[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit startDate:&startOfToday interval:NULL forDate:now];
[[NSCalendar currentCalendar] rangeOfUnit:NSWeekCalendarUnit startDate:&startOfThisWeek interval:NULL forDate:now];
[[NSCalendar currentCalendar] rangeOfUnit:NSMonthCalendarUnit startDate:&startOfThisMonth interval:NULL forDate:now];
[[NSCalendar currentCalendar] rangeOfUnit:NSYearCalendarUnit startDate:&startOfThisYear interval:NULL forDate:now];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterFullStyle];
[formatter setTimeStyle:NSDateFormatterFullStyle];
NSLog(#"%#", [formatter stringFromDate:now]);
NSLog(#"%#", [formatter stringFromDate:startOfToday]);
NSLog(#"%#", [formatter stringFromDate:startOfThisWeek]);
NSLog(#"%#", [formatter stringFromDate:startOfThisMonth]);
NSLog(#"%#", [formatter stringFromDate:startOfThisYear]);
result:
Thursday, July 12, 2012, 4:36:07 PM Central European Summer Time
Thursday, July 12, 2012, 12:00:00 AM Central European Summer Time
Sunday, July 8, 2012, 12:00:00 AM Central European Summer Time
Sunday, July 1, 2012, 12:00:00 AM Central European Summer Time
Sunday, January 1, 2012, 12:00:00 AM Central European Standard Time
this allows us to shorten the first code to:
[[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit startDate:&date1 interval:NULL forDate:date1];
[[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit startDate:&date2 interval:NULL forDate:date2];
NSComparisonResult result = [date1 compare:date2];
if (result == NSOrderedAscending) {
} else if (result == NSOrderedDescending) {
} else {
//the same
}
Note, that in this code, date1 and date2 will be overwritten. Alternatively you can pass in a reference to another NSDate pointer for startDate as shown in the code above, where now stays untouched.
I have used another method with NSDateFormatter and a string comparison, less smarter than
NSDate compare method but faster to write and flexible enough to do variety of comparison :
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-dd"];
if ([[dateFormat stringFromDate:date1] isEqualToString:[dateFormat stringFromDate:date2]])
{
//It's the same day
}
Okay, so it's a few years after the original question was asked, but it's probably worth mentioning that NSCalendar now has a number of methods that make certain date comparison questions much more straight-forward:
NSCalendar *currentCalendar = [NSCalendar currentCalendar];
Bool sameDay = [currentCalendar isDate:dateA inSameDayAsDate:dateB];
Swift Version , Comparing Dates and ignoring their time.
let dateExam1:NSDate = NSDate.init(timeIntervalSinceNow: 300)
let dateExam2:NSDate = NSDate.init(timeIntervalSinceNow: 10000)
let currCalendar = NSCalendar.currentCalendar()
let dateCompanent1:NSDateComponents = currCalendar.components([.Year,.Month,.Day], fromDate: dateExam1)
let dateCompanent2:NSDateComponents = currCalendar.components([.Year,.Month,.Day], fromDate: dateExam2)
let date1WithoutTime:NSDate? = currCalendar .dateFromComponents(dateCompanent1)
let date2WithoutTime:NSDate? = currCalendar .dateFromComponents(dateCompanent2)
if (date1WithoutTime != nil) && (date2WithoutTime != nil)
{
let dateCompResult:NSComparisonResult = date1WithoutTime!.compare(date2WithoutTime!)
if (dateCompResult == NSComparisonResult.OrderedSame)
{
print("Same Dates")
}
else
{
print("Different Dates")
}
}
Updating #LuAndre answer swift 5
let dateExam1 = Date(timeIntervalSinceNow: 300)
let dateExam2 = Date(timeIntervalSinceNow: 10000)
let currCalendar = Calendar.current
let dateCompanent1 = currCalendar.dateComponents([.year,.month,.day], from: dateExam1)
let dateCompanent2 = currCalendar.dateComponents([.year,.month,.day], from: dateExam2)
if let date1WithoutTime = currCalendar.date(from:dateCompanent1), let dateCompanent2 = currCalendar.date(from:dateCompanent2) {
let dateCompResult = date1WithoutTime.compare(dateCompanent2)
if (dateCompResult == ComparisonResult.orderedSame)
{
print("Same Dates")
}
else
{
print("Different Dates")
}
}
I have two dates: 2009-05-11 and the current date. I want to check whether the given date is the current date or not. How is this possible.
Cocoa has couple of methods for this:
in NSDate
– isEqualToDate:
– earlierDate:
– laterDate:
– compare:
When you use - (NSComparisonResult)compare:(NSDate *)anotherDate ,you get back one of these:
The receiver and anotherDate are exactly equal to each other, NSOrderedSame
The receiver is later in time than anotherDate, NSOrderedDescending
The receiver is earlier in time than anotherDate, NSOrderedAscending.
example:
NSDate * now = [NSDate date];
NSDate * mile = [[NSDate alloc] initWithString:#"2001-03-24 10:45:32 +0600"];
NSComparisonResult result = [now compare:mile];
NSLog(#"%#", now);
NSLog(#"%#", mile);
switch (result)
{
case NSOrderedAscending: NSLog(#"%# is in future from %#", mile, now); break;
case NSOrderedDescending: NSLog(#"%# is in past from %#", mile, now); break;
case NSOrderedSame: NSLog(#"%# is the same as %#", mile, now); break;
default: NSLog(#"erorr dates %#, %#", mile, now); break;
}
[mile release];
Here buddy. This function will match your date with any specific date and will be able to tell whether they match or not. You can also modify the components to match your requirements.
- (BOOL)isSameDay:(NSDate*)date1 otherDay:(NSDate*)date2 {
NSCalendar* calendar = [NSCalendar currentCalendar];
unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents* comp1 = [calendar components:unitFlags fromDate:date1];
NSDateComponents* comp2 = [calendar components:unitFlags fromDate:date2];
return [comp1 day] == [comp2 day] &&
[comp1 month] == [comp2 month] &&
[comp1 year] == [comp2 year];}
Regards,
Naveed Butt
NSDate *today = [NSDate date]; // it will give you current date
NSDate *newDate = [NSDate dateWithString:#"xxxxxx"]; // your date
NSComparisonResult result;
//has three possible values: NSOrderedSame,NSOrderedDescending, NSOrderedAscending
result = [today compare:newDate]; // comparing two dates
if(result==NSOrderedAscending)
NSLog(#"today is less");
else if(result==NSOrderedDescending)
NSLog(#"newDate is less");
else
NSLog(#"Both dates are same");
There are other ways that you may use to compare an NSDate objects. Each of the
methods will be more efficient at certain tasks. I have chosen the compare method
because it will handle most of your basic date comparison needs.
This category offers a neat way to compare NSDates:
#import <Foundation/Foundation.h>
#interface NSDate (Compare)
-(BOOL) isLaterThanOrEqualTo:(NSDate*)date;
-(BOOL) isEarlierThanOrEqualTo:(NSDate*)date;
-(BOOL) isLaterThan:(NSDate*)date;
-(BOOL) isEarlierThan:(NSDate*)date;
//- (BOOL)isEqualToDate:(NSDate *)date; already part of the NSDate API
#end
And the implementation:
#import "NSDate+Compare.h"
#implementation NSDate (Compare)
-(BOOL) isLaterThanOrEqualTo:(NSDate*)date {
return !([self compare:date] == NSOrderedAscending);
}
-(BOOL) isEarlierThanOrEqualTo:(NSDate*)date {
return !([self compare:date] == NSOrderedDescending);
}
-(BOOL) isLaterThan:(NSDate*)date {
return ([self compare:date] == NSOrderedDescending);
}
-(BOOL) isEarlierThan:(NSDate*)date {
return ([self compare:date] == NSOrderedAscending);
}
#end
Simple to use:
if([aDateYouWantToCompare isEarlierThanOrEqualTo:[NSDate date]]) // [NSDate date] is now
{
// do your thing ...
}
If you make both dates NSDates you can use NSDate's compare: method:
NSComparisonResult result = [Date2 compare:Date1];
if(result==NSOrderedAscending)
NSLog(#"Date1 is in the future");
else if(result==NSOrderedDescending)
NSLog(#"Date1 is in the past");
else
NSLog(#"Both dates are the same");
You can take a look at the docs here.
By this method also you can compare two dates
NSDate * dateOne = [NSDate date];
NSDate * dateTwo = [NSDate date];
if([dateOne compare:dateTwo] == NSOrderedAscending)
{
}
The best way I found was to check the difference between the given date and today:
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDate* now = [NSDate date];
int differenceInDays =
[calendar ordinalityOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitEra forDate:date] -
[calendar ordinalityOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitEra forDate:now];
According to Listing 13 of Calendrical Calculations in Apple's Date and Time Programming Guide [NSCalendar ordinalityOfUnit:NSDayCalendarUnit inUnit: NSEraCalendarUnit forDate:myDate] gives you the number of midnights since the start of the era.
This way it's easy to check whether the date is yesterday, today, or tomorrow.
switch (differenceInDays) {
case -1:
dayString = #"Yesterday";
break;
case 0:
dayString = #"Today";
break;
case 1:
dayString = #"Tomorrow";
break;
default: {
NSDateFormatter* dayFormatter = [[NSDateFormatter alloc] init];
[dayFormatter setLocale:usLocale];
[dayFormatter setDateFormat:#"dd MMM"];
dayString = [dayFormatter stringFromDate: date];
break;
}
}
NSDateFormatter *df= [[NSDateFormatter alloc] init];
[df setDateFormat:#"yyyy-MM-dd"];
NSDate *dt1 = [[NSDate alloc] init];
NSDate *dt2 = [[NSDate alloc] init];
dt1=[df dateFromString:#"2011-02-25"];
dt2=[df dateFromString:#"2011-03-25"];
NSComparisonResult result = [dt1 compare:dt2];
switch (result)
{
case NSOrderedAscending: NSLog(#"%# is greater than %#", dt2, dt1); break;
case NSOrderedDescending: NSLog(#"%# is less %#", dt2, dt1); break;
case NSOrderedSame: NSLog(#"%# is equal to %#", dt2, dt1); break;
default: NSLog(#"erorr dates %#, %#", dt2, dt1); break;
}
Enjoy coding......
In Cocoa, to compare dates, use one of isEqualToDate, compare, laterDate, and earlierDate methods on NSDate objects, instantiated with the dates you need.
Documentation:
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html#//apple_ref/occ/instm/NSDate/isEqualToDate:
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html#//apple_ref/occ/instm/NSDate/earlierDate:
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html#//apple_ref/occ/instm/NSDate/laterDate:
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html#//apple_ref/occ/instm/NSDate/compare:
What you really need is to compare two objects of the same kind.
Create an NSDate out of your string date (#"2009-05-11") :
http://blog.evandavey.com/2008/12/how-to-convert-a-string-to-nsdate.html
If the current date is a string too, make it an NSDate. If its already an NSDate, leave it.
Here's the Swift variant on Pascal's answer:
extension NSDate {
func isLaterThanOrEqualTo(date:NSDate) -> Bool {
return !(self.compare(date) == NSComparisonResult.OrderedAscending)
}
func isEarlierThanOrEqualTo(date:NSDate) -> Bool {
return !(self.compare(date) == NSComparisonResult.OrderedDescending)
}
func isLaterThan(date:NSDate) -> Bool {
return (self.compare(date) == NSComparisonResult.OrderedDescending)
}
func isEarlierThan(date:NSDate) -> Bool {
return (self.compare(date) == NSComparisonResult.OrderedAscending)
}
}
Which can be used as:
self.expireDate.isEarlierThanOrEqualTo(NSDate())
Here's the function from Naveed Rafi's answer converted to Swift if anyone else is looking for it:
func isSameDate(#date1: NSDate, date2: NSDate) -> Bool {
let calendar = NSCalendar()
let date1comp = calendar.components(.YearCalendarUnit | .MonthCalendarUnit | .DayCalendarUnit, fromDate: date1)
let date2comp = calendar.components(.YearCalendarUnit | .MonthCalendarUnit | .DayCalendarUnit, fromDate: date2)
return (date1comp.year == date2comp.year) && (date1comp.month == date2comp.month) && (date1comp.day == date2comp.day)
}
Get Today's Date:
NSDate* date = [NSDate date];
Create a Date From Scratch:
NSDateComponents* comps = [[NSDateComponents alloc]init];
comps.year = 2015;
comps.month = 12;
comps.day = 31;
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDate* date = [calendar dateFromComponents:comps];
Add a day to a Date:
NSDate* date = [NSDate date];
NSDateComponents* comps = [[NSDateComponents alloc]init];
comps.day = 1;
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDate* tomorrow = [calendar dateByAddingComponents:comps toDate:date options:nil];
Subtract a day from a Date:
NSDate* date = [NSDate date];
NSDateComponents* comps = [[NSDateComponents alloc]init];
comps.day = -1;
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDate* yesterday = [calendar dateByAddingComponents:comps toDate:date options:nil];
Convert a Date to a String:
NSDate* date = [NSDate date];
NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
formatter.dateFormat = #"MMMM dd, yyyy";
NSString* dateString = [formatter stringFromDate:date];
Convert a String to a Date:
NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
formatter.dateFormat = #"MMMM dd, yyyy";
NSDate* date = [formatter dateFromString:#"August 02, 2014"];
Find how many days are in a month:
NSDate* date = [NSDate date];
NSCalendar* cal = [NSCalendar currentCalendar];
NSRange currentRange = [cal rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:date];
NSInteger numberOfDays = currentRange.length;
Calculate how much time something took:
NSDate* start = [NSDate date];
for(int i = 0; i < 1000000000; i++);
NSDate* end = [NSDate date];
NSTimeInterval duration = [end timeIntervalSinceDate:start];
Find the Day Of Week for a specific Date:
NSDate* date = [NSDate date];
NSCalendar* cal = [NSCalendar currentCalendar];
NSInteger dow = [cal ordinalityOfUnit:NSWeekdayCalendarUnit inUnit:NSWeekCalendarUnit forDate:date];
Then use NSComparisonResult to compare date.
..
NSString *date = #"2009-05-11"
NSString *nowDate = [[[NSDate date]description]substringToIndex: 10];
if([date isEqualToString: nowDate])
{
// your code
}