Get array of dates between today and given date in Swift? - swift

Question

I have a date in string format, "yyyy-MM-dd" and would like to return an array of the difference in dates in that same format from today.
For example, the given date is "2019-06-29", and today's date is 2019-06-25. The returned array would contain: ["2019-06-25", "2019-06-26", "2019-06-27", "2019-06-28", "2019-06-29"].
The method I am trying to write needs to also work cross-months/years. Is something like this possible in Swift?
What I have tried: calculating the difference in dates numerically (difference of days) and adding a day to the given date until it reaches today's date. This is what brought on the issue of exceeding 30/31 days and not moving to the next months/exceeding 2019-12-31 and not moving to 2020. Surely there is a simpler concise way to achieve this result without having to write that date logic manually?

Answer 1

extension Formatter {
static let date: DateFormatter = {
let dateFormatter = DateFormatter()
dateFormatter.calendar = Calendar(identifier: .iso8601)
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd"
return dateFormatter
}()
}
extension Date {
var noon: Date {
return Calendar.current.date(bySettingHour: 12, minute: 0, second: 0, of: self)!
}
}
func dates(for date: String) -> [String] {
// For calendrical calculations you should use noon time
// So lets get endDate's noon time
guard let endDate = Formatter.date.date(from: date)?.noon else { return [] }
// then lets get today's noon time
var date = Date().noon
var dates: [String] = []
// while date is less than or equal to endDate
while date <= endDate {
// add the formatted date to the array
dates.append( Formatter.date.string(from: date))
// increment the date by one day
date = Calendar.current.date(byAdding: .day, value: 1, to: date)!
}
return dates
}
dates(for: "2019-06-29") // ["2019-06-25", "2019-06-26", "2019-06-27", "2019-06-28", "2019-06-29"]