UILabel with superscript text

Several ways. Some examples:

        //Using attributed string
        let baseString = NSAttributedString(string: "1:47",
            attributes: [
            .font: UIFont.systemFont(ofSize: 48),
        ])
        let pmString = NSAttributedString(string: "PM",
            attributes: [
            .baselineOffset: 16,
            .font: UIFont.systemFont(ofSize: 28),
        ])
        let attributedString = NSMutableAttributedString()
        attributedString.append(baseString)
        attributedString.append(pmString)
        label1.attributedText = attributedString
        label1.backgroundColor = .black
        label1.textColor = .white
        
        //Using Unicode characters
        //let text = "1:47\u{1D3E}\u{1D39}"
        let text = "1:47\u{1D2C}\u{1D39}"
        label2.text = text
        label2.backgroundColor = .black
        label2.textColor = .white

If you can find a better font (which may not be included in standard iOS devices), the result may get better:

override func viewDidLoad() {
	super.viewDidLoad()
	
	let text = "1:47PM"
	if let regularFont = UIFont(name: "Helvetica", size: 20.0), let subscriptFont = UIFont(name: "TamilSangamMN", size: 12.0) {
		let attString:NSMutableAttributedString = NSMutableAttributedString(string: text, attributes: [.font: regularFont])
		attString.setAttributes([.font: subscriptFont, .baselineOffset: 6], range: NSRange(location: text.count - 2, length: 2))
		label.attributedText = attString
	}
}