Number of days between two dates

Here is a code given below for calculating the number of days between a specific date and current date i.e today’s date.

So first of all code to fetch the current date or today’s date is given below followed by calculation of number of days between two dates.

NSDate *currentDate = [NSDate date];// use to fetch the current date
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];//formatter is used to set the format of date you want
        [dateFormatter setDateFormat:@"YYYY.MM.dd];//here is the format which is required
        NSString *currentDateString = [dateFormatter stringFromDate:currentDate];// Here current date with the specific format is assigned to the NSString
        NSLog(@%@,currentDateString);// printing the string to check weather it display the current date or not

        
Now we have to take an another date for taking out the number of days between two dates so here we will provide the date in the format of string by own.   

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];//defining the format of date
       [formatter setDateFormat:@"YYYY.MM.dd"];
       NSDate *startDate = [formatter dateFromString:@2016.04.20];//Here we provide the start date
       NSDate *endDate = [formatter dateFromString:currentDateString];//Here we provide the end date i.e current date/todays date
       unsigned flags = NSCalendarUnitDay;//Performs the difference calculation between start and end date
       NSDateComponents *noOfDays = [[NSCalendar currentCalendar] components:flags fromDate:startDate toDate:endDate options:0];// calculating the difference
       NSLog(@"%ld", [noOfDays day]);//this will display the number of days between two given dates

In this way we can calculate the number of days between two dates.