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macOS Days difference calculation gives wrong results.

N

newformac

macrumors regular
Original poster
May 24, 2011
107
0
I am calculating days difference between two dates as below:

but in result its give day 1 but exactly its 31 days.

Code: 
NSString * lastdate_str=@"2010-06-12";
NSString * todayString=@"2010-07-13";

NSDate *lastDate = [dateFormatter dateFromString:lastdate_str];
	
NSDate *todaysDate = [dateFormatter dateFromString:todayString];
	
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *differenceComponents = [calendar components:NSMonthCalendarUnit | NSDayCalendarUnit fromDate:lastDate toDate:todaysDate options:0];
	
int daysDifference = [differenceComponents day];

please help me for this.

thanks in advance.
 
Last edited by a moderator:
K

kainjow

Moderator emeritus
Jun 15, 2000
7,958
7
You're using NSMonthCalendarUnit as well, so the NSDateComponents value will will give you the number of months, plus the remaining number of days. If you *only* want days, remove NSMonthCalendarUnit and just use NSDayCalendarUnit.

From the documentation:
...generally larger components will be computed before smaller components; for example, in the Gregorian calendar a result might be 1 month and 5 days instead of, for example, 0 months and 35 days.
Click to expand...
 
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