Validating EditText to having time in kotlin Android

Question

I have a screen which have 2 edit text one edit text shows hour and other shows minute

I have number of validations that needs to be performed on this

hour edit Text

• check if entered string if of 12 hour format
• if user enter like 70 show error Tost and convert it ->07
• if enter some number like 73 show error and remove last char and make it like ->07

minute Edit Text

• value should be from 0>59

• if entered 60 make it 00

• if value entered is 80 ->show error ->convert it to 08

• if value entered is 89 -> show error -> remove char and show as 08

   beginHour!!.addTextChangedListener(object : TextWatcher {
       override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}
       override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
           if (p0.toString().isNotEmpty()) {
               if (TextUtils.isDigitsOnly(p0.toString())) {
                   val hour = Integer.parseInt(p0.toString());
                   if (hour > maxHourValue || hour <= 0) {
                       shortToast(errorMessage)
                       beginHour!!.setText(beginHourString)
                   } else {
                       beginHourString = hour.toString()
                   }
               } else {
                   shortToast(errorMessage)
                   beginHour!!.setText(beginHourString)
               }
           } else {
               beginHourString = ""
           }
       }
  
       override fun afterTextChanged(p0: Editable?) {
       }
   })
  
   beginHour!!.setOnFocusChangeListener { _, hasFocus ->
       if (!hasFocus) {
           try {
               if (beginHour!!.text.isNullOrEmpty()) {
                   beginHour!!.setText("08")
                   beginHourString = "08"
               }
               val hour = 
           Integer.parseInt(beginHour!!.text.toString())
  
              if (value in 0..9) {
                 beginHour.setText("0$value")
           } else {
           beginHour.setText(value.toString())
            }
  
  
           } catch (exception: NumberFormatException) {
           }
       }
   }
  

can anyone suggest and guide me how to implement these validations