How to print name of the day of the week? - ios

Question

Im trying to print out the name of the day of the week i.e Monday, Tuesday, Wednesday. I currently have this bit of code that does just that. I was wondering if there is a way to get rid of my switch statement and make this better. Thanks!
func getDayOfWeek(_ today: String) -> String? {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
guard let todayDate = formatter.date(from: today) else { return nil }
let myCalendar = Calendar(identifier: .gregorian)
let weekDay = myCalendar.component(.weekday, from: todayDate)
switch weekDay {
case 1:
return "Sunday"
case 2:
return "Monday"
case 3:
return "Tuesday"
case 4:
return "Wednesday"
case 5:
return "Thursday"
case 6:
return "Friday"
case 7:
return "Saturday"
default:
return ""
}
}
getDayOfWeek("2018-3-5")
This prints out "Monday"

Answer 1

You are using the wrong date format. The correct format is "yyyy-M-d". Besides that you can use Calendar property weekdaySymbols which returns the weekday localized.
func getDayOfWeek(_ date: String) -> String? {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-M-d"
formatter.locale = Locale(identifier: "en_US_POSIX")
guard let todayDate = formatter.date(from: date) else { return nil }
let weekday = Calendar(identifier: .gregorian).component(.weekday, from: todayDate)
return Calendar.current.weekdaySymbols[weekday-1] // "Monday"
}
Another option is to use DateFormatter and set your dateFormat to "cccc" as you can see in this answer:
extension Formatter {
static let weekdayName: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "cccc"
return formatter
}()
static let customDate: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-M-d"
formatter.locale = Locale(identifier: "en_US_POSIX")
return formatter
}()
}
extension Date {
var weekdayName: String { Formatter.weekdayName.string(from: self) }
}
Using the extension above your function would look like this:
func getDayOfWeek(_ date: String) -> String? { Formatter.customDate.date(from: date)?.weekdayName }
Playground testing:
getDayOfWeek("2018-3-5") // Monday
Date().weekdayName // Thursday

Answer 2

Use this function:
func DayOfWeek(date: String) -> String?
{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-M-d"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
guard let _date = dateFormatter.date(from: date) else { return nil }
let weekday = Calendar(identifier: .gregorian).component(.weekday, from: _date)
return Calendar.current.weekdaySymbols[weekday-1]
}