About character string formatting of date - ios

Question

This function gets the tapped date when tapping the calendar date.
What I want to realize is, for example, when I tap 2018/11/1, I want to get the string "2018/11/01", but I do not know how to do it. Could you tell me?
func getDay(_ date:Date) -> (Int,Int,Int,String){
let tmpCalendar = Calendar(identifier: .gregorian)
let Component = tmpCalendar.component(.weekday, from: date)
let weekName = Component - 1
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "ja")
let year = tmpCalendar.component(.year, from: date)
let month = tmpCalendar.component(.month, from: date)
let day = tmpCalendar.component(.day, from: date)
return (year,month,day,formatter.shortWeekdaySymbols[weekName])
}
func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: FSCalendarMonthPosition){
let selectDay = getDay(date)
let scheduleForDate = "\(String(selectDay.0))/\(String(selectDay.1))/\(String(selectDay.2))"
print(scheduleForDate)
getStartScheduleDate(date: scheduleForDate)
tableView.reloadData()
}
By the way, the library I am using is FSCalendar.

Answer 1

Use a DateFormatter set to the format you want.
let formatter = DateFormatter()
formatter.dateFormat = "yyyy/MM/dd"
let result = formatter.string(from: someDate)
But it's not a good idea to use such a format to show dates to a user. It's ambiguous. Is that November 1st or January 11th?
It's better to use a date style so the date is shown to the user in their own expected format given their locale.
let formatter = DateFormatter()
formatter.dateStyle = .short
let result = formatter.string(from: someDate)
Or at least localize the specific format:
let formatter = DateFormatter()
formatter.setLocalizedDateFormatFromTemplate("yyyyMMdd")
let result = formatter.string(from: someDate)