Creating UNNotification with non Gregorian Calendar

I’m building my App to fire daily, weekly and monthly notifications in IOS swift 4. The notifications work perfectly using Gregorian calendar. However, when I change the date to Hijri calendar (Calendar(identifier: .islamicUmmAlQura) it does not wrk. It seams the UNCalendarNotificationTrigger converts any date to Gregorian calendar. Below monthly notification code works perfectly when using Gregorian calendar:

func myNotification(at date: Date, withTitle title:String, andBody body:String, notificationIdentifier:String) {

let calendar = Calendar(identifier: .gregorian)
let components = calendar.dateComponents([.day,.hour, .minute], from: date)
let trigger = UNCalendarNotificationTrigger(dateMatching: components, repeats: true)
let content = UNMutableNotificationContent()
content.title = title
content.body = body
content.sound = UNNotificationSound.init(named: "notificationSound.wav")
let request = UNNotificationRequest(identifier: notificationIdentifier, content: content, trigger: trigger)
UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: [notificationIdentifier])
UNUserNotificationCenter.current().add(request) {(error) in
    if let error = error {
        print(" error: \(error)")
    }
}

}

The below code does not work when I covert the date to Islamic date using (Calendar(identifier: .islamicUmmAlQura) :

func myNotification(at date: Date, withTitle title:String, andBody body:String, notificationIdentifier:String) {

let calendar = Calendar(identifier: .islamicUmmAlQura)
let components = calendar.dateComponents([.day,.hour, .minute], from: date)
let trigger = UNCalendarNotificationTrigger(dateMatching: components, repeats: true)
let content = UNMutableNotificationContent()
content.title = title
content.body = body
content.sound = UNNotificationSound.init(named: "notificationSound.wav")
let request = UNNotificationRequest(identifier: notificationIdentifier, content: content, trigger: trigger)
UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: [notificationIdentifier])
UNUserNotificationCenter.current().add(request) {(error) in
    if let error = error {
        print(" error: \(error)")
    }
}

It worked after adding the calendar type to the trigger

trigger = UNCalendarNotificationTrigger(calendar:calendar, dateMatching: components, repeats: true)