Question

This is my first time comparing dates in Objective-C. I’ve been searching the web for a while and all the examples I found involve building a NSDate from a string so I decided to ask a new question here…
My question is as follows:

I need to know if two NSDates are in the same day, ignoring the time. I got two NSArray‘s containing a set of dates and one by one I need to determine which one from the first NSArray is in the same day as in the second array.

- (void)setActiveDaysColor:(UIColor *)activeDaysColor
{
    for (DayView *actualDay in _days)
    {
        NSDate *actualDayDate = [actualDay date];

        for (NSDate *activeDayDate in self.dates)
        {
            // Comparison code
            // If both dates are the same, tint actualDay with a different color
        }
    }
}

Thank you in advance and have a nice day.

Alex.

Answer 1

create new dates by omitting the time components. and use one of the compare methods

• earlierDate:
• laterDate:
• compare:
• isEqualToDate

example

NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger components = (NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit);

NSDateComponents *firstComponents = [calendar components:components fromDate:firstDate];
NSDateComponents *secondComponents = [calendar components:components fromDate:secondDate];

NSDate *date1 = [calendar dateFromComponents:firstComponents];
NSDate *date2 = [calendar dateFromComponents:secondComponents];

NSComparisonResult result = [date1 compare:date2];
if (result == NSOrderedAscending) {
} else if (result == NSOrderedDescending) {
}  else {
}