Question

How to get the number of the day from the beginning of the year to a given date in Swift

Answer 1

func isLeapYear(_ year: Int) -> Bool {
    return (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0))
}

func getDayOfYear(year: Int, month: Int, day: Int) -> Int {
    // cumulative days at the end of each month (non-leap year)
    let days = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334]

    if isLeapYear(year) && month > 2 {
        return days[month - 1] + day + 1
    } else {
        return days[month - 1] + day
    }
}

let dayOfYear = getDayOfYear(year: 2023, month: 5, day: 15)

print(dayOfYear) 




/*
run:

135

*/

 

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