How do I calculate the number of days in this year in Objective C

Question

How can i calculate the number of days in a year for any calendar, not just gregorian. I have tried this

NSUInteger *days = [[NSCalendar currentCalendar] range

Answer 1

Best solution found for this problem using SWIFT 5.3 and Xcode 12.

Put it into playgrounds, call the checkLeapYear function passing a year into it and play around.

func checkLeapYear(year: Int) {
    if year % 4 == 0{
        if year % 100 == 0 {
            if year % 400 == 0{
                print("\(year) is a Leap Year!")
            } else {
                print("\(year) is NOT a Leap Year!")
            }
        } else {
            print("\(year) is a Leap Year!")
        }
    } else {
        print("\(year) is NOT a Leap Year!")
    }
}

The algorithm is quite tricky so I suggest you use the following logic when performing it on your own:

1. If the year is evenly divisible by 4, go to step 2. Otherwise, go to step 5.
2. If the year is evenly divisible by 100, go to step 3. Otherwise, go to step 4.
3. If the year is evenly divisible by 400, go to step 4. Otherwise, go to step 5.
4. The year is a leap year.
5. The year is not a leap year.