Date Difference in IOS [closed] - ios

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I had Two Dates from date and to date. I stored two dates in NSString like string1 and string 2 respectively. Now My Problem is I want the difference of these two dates. My Date format is 04-Mar-2014 and 14-Mar-2014 and I want the result to be like 10.

Answer 1

You can get difference by using the code given below:-
NSString *start = #"2010-09-01";
NSString *end = #"2010-12-01";
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:#"yyyy-MM-dd"];
NSDate *startDate = [f dateFromString:start];
NSDate *endDate = [f dateFromString:end];
[f release];
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorianCalendar components:NSDayCalendarUnit
fromDate:startDate
toDate:endDate
options:0];
[gregorianCalendar release];
components now holds the difference.
NSLog(#"%ld", [components day]);
Courtesy:-vikingosegundo
https://stackoverflow.com/a/4576575/1865424

Answer 2

Three methods you need are:
+ (NSDateFormatter *)dateFormatter
{
static NSDateFormatter *dateFormatter = nil;
if (dateFormatter == nil)
{
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"YOUR_STRING_FORMAT"];
}
[NSTimeZone resetSystemTimeZone];
[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
return dateFormatter;
}
+ (NSDate *)dateWithString:(NSString *)dateString
{
return [[self dateFormatter] dateFromString:dateString];
}
- (NSInteger)distanceInDaysToDate:(NSDate *)date
{
NSDateComponents *components1 = [CURRENT_CALENDAR components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:self];
components1.hour = 0;
components1.minute = 0;
components1.second = 0;
NSDateComponents *components2 = [CURRENT_CALENDAR components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:date];
components1.hour = 0;
components1.minute = 0;
components1.second = 0;
NSDate *date1 = [CURRENT_CALENDAR dateFromComponents:components1];
NSDate *date2 = [CURRENT_CALENDAR dateFromComponents:components2];
NSDateComponents *components = [CURRENT_CALENDAR components:NSDayCalendarUnit fromDate:date1 toDate:date2 options:0];
return components.day;
}
Best if you move them into NSDate category.

Answer 3

You Two date is
NSString* str1 = #"04-Mar-2014";
NSString* str2 = #"14-Mar-2014";
Now convert two date in to DD-MM-YYY as below
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"dd-MM-yyyy"];
Now string convert into date
NSDate *date1 = [dateFormat dateFromString:str1];
NSDate *date2 = [dateFormat dateFromString:str2];
Calculation of convert between two date
NSTimeInterval distanceBetweenDates = [date2 timeIntervalSinceDate:date1];
double secondsInAnHour = 3600;
NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;
NSInteger day = hoursBetweenDates/ 24;
Your OUTPUT : 10

Answer 4

I think, according to your question, my assumption is difference between two dates. You can use this.
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"dd-MM-yyyy"];
NSDate *date1 = [dateFormat dateFromString:#"04-Mar-2014"];
NSDate *date2 = [dateFormat dateFromString:#"14-Mar-2014"];
NSTimeInterval secondsBetween = [date2 timeIntervalSinceDate:date1];
int numberOfDays = secondsBetween / 86400;
NSLog(#"There are %d days in between the two dates.", numberOfDays);

Answer 5

While keeping the NSDate objects is the best solution, you can recreate NSDateobjects from the string using an NSDateFormatter with its format string set accordingly to your date format.
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"dd-MMM-yy"];
[dateFormatter dateFromString:yourString];
Then you can use for example the timerIntervalSinceDate:method of NSDateand calculate the difference. Alternatively you can extract NSDateComponentsand get the difference that way.