Using a NumberFormatter within a DateFormatter

I'm attempting to format my Date() to look like Saturday, June 12th • 5PM - 12PM. I've been able to solve the majority of this with the following DateFormatter():

var date_formatter: DateFormatter {
    let formatter = DateFormatter()
    formatter.dateFormat = "EEEE, MMMM d • HHa - HHa"
    return formatter
}

Which results in Saturday, June 12 • 5PM - 12PM

The challenge I'm having is understanding how to add the ordinal suffix (i.e. 12 -> 12th). I've seen a bit on the NumberFormatter(), but am not entirely sure how to integrate the two.

EDIT: Ended up having to create two formats for the 5PM - 12PM logic.

This looks like:

var start_time_formatter: DateFormatter {
        let formatter = DateFormatter()
        formatter.dateFormat = "EEEE, MMMM d • HHa -"
        return formatter
    }

    var end_time_formatter: DateFormatter {
        let formatter = DateFormatter()
        formatter.dateFormat = "HHa"
        return formatter
    }

with the following to display it in a view:

Text("\(self.create_event_vm.start_time, formatter: self.start_time_formatter) \(self.create_event_vm.end_time, formatter: self.end_time_formatter)")

I understand this is a bit funky and could use some refactoring, but I'm hoping to get the desired effect, test, then refactor.

First for the day suffix you can create below function

func getDaySuffix(from date: Date) -> String {  
    switch Calendar.current.component(.day, from: date) {
    case 1, 21, 31: return "st"
    case 2, 22: return "nd"
    case 3, 23: return "rd"
    default: return "th"
    }
}

and combine with your codes :

let startDate = Date()
let endDate = Calendar.current.date(byAdding: .hour, value: 5, to: startDate)!

var startTimeFormatter: DateFormatter {
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "en_US_POSIX")
    formatter.dateFormat = "EEEE, MMMM d'\(getDaySuffix(from: startDate))' • ha - "
    return formatter
}

var endTimeFormatter: DateFormatter {
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "en_US_POSIX")
    formatter.dateFormat = "ha"
    return formatter
}

let startDateResult = startTimeFormatter.string(from: startDate) // "Thursday, June 18th • 2AM - "
let endDateResult = endTimeFormatter.string(from: endDate) // "7AM"
let finalResult = startDateResult + endDateResult // "Thursday, June 18th • 2AM - 7AM"