How to add days to a date in swift 3

Question

I am getting number of days,Start date and end date from a service. I want to get the list of all dates in between start date and end date. Let\'s say my start date is 2017/

Answer 1

You are making it really complicated.Just use simple date class methods for difference and generate new dates with a for loop and Calendar class.

let startDate = Date()
let endDate = Date(timeInterval: 2*86400, since: startDate)


let components = Calendar.current.dateComponents([.day], from: startDate, to: endDate)
let numberOfDays = components.day ?? 0

for i in 1...numberOfDays {
    let nextDate = Calendar.current.date(byAdding: .day, value: i, to: startDate)
    print(nextDate)
}

Answer 2

A simple while loop will get you what you need. Example:

func generateDates(startDate :Date?, addbyUnit:Calendar.Component, value : Int) -> [Date] {

    var dates = [Date]()
    var date = startDate!
    let endDate = Calendar.current.date(byAdding: addbyUnit, value: value, to: date)!
    while date < endDate {
        date = Calendar.current.date(byAdding: addbyUnit, value: 1, to: date)!
        dates.append(date)
    }
    return dates
}

Edit: Or you can change your implementation slightly if you get your end date in advance

func generateDates(between startDate: Date?, and endDate: Date?, byAdding: Calendar.Component) -> [Date] {

    var dates = [Date]()
    guard var date = startDate, let endDate = endDate else {
        return []
    }
    while date < endDate {
        date = Calendar.current.date(byAdding: byAdding, value: 1, to: date)!
        dates.append(date)
    }
    return dates
}