Cannot convert return expression of type 'Date' to return type 'Date'

.swift

class Date {
    
    class func from(year: Int, month: Int , day: Int ) -> Date {
        let gregorianCalendar = NSCalendar(calendarIdentifier: .gregorian)!
        
        var dateComponents   = DateComponents()
        dateComponents.year  = year
        dateComponents.month = month
        dateComponents.day   = day
        
        let date = gregorianCalendar.date(from: dateComponents)!
        return date
    }
}