Date picker

DatePicker.kt

import android.app.DatePickerDialog
import android.widget.EditText
import java.text.DecimalFormat
import android.graphics.Color
import android.graphics.drawable.ColorDrawable

dateText.setOnClickListener {
    setDatePickerAction(it as EditText)
    openDatePicker()
}

private fun setDatePickerAction(){


        // SET ACTION AFTER SELECTING THE DATE
        mDateSetListener = DatePickerDialog.OnDateSetListener { datePicker, year, month, day ->

            // FORMAT  DAY and MONTH to always show two digits (add zero if single digit)
            var mFormat = DecimalFormat("00");
            var monthString = mFormat.format(month + 1)
            var dayString = mFormat.format(day)

            val dateInMilliseconds = convertDateToMilliseconds(year, month, day,12, 0, 0)

            // PUT THE SELECTED DATE ON THE DATE PLACEHOLDER
            dateText.setText("${year}-${monthString}-${dayString}")

            // TODO: How to get current AGE??

            // If todays month is greater than current month
            // if todays day is greater than or equals to day

        }

    }

private fun openDatePicker() {

        // INSTANTIATE CALENDAR
        var cal = Calendar.getInstance()
        cal.add(Calendar.YEAR, 0)

        var year = cal.get(Calendar.YEAR)
        var month = cal.get(Calendar.MONTH)
        var day = cal.get(Calendar.DAY_OF_MONTH)

        // INSTANTIATE DATE PICKER DIALOG
        var dialog = DatePickerDialog(this, android.R.style.Theme_Holo_Light_Dialog_MinWidth, mDateSetListener, year, month, day)

        // SET DATE PICKER DIALOG STYLE
        dialog.window!!.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))

        // SHOW THE DATE PICKER DIALOG
        dialog.show()

    }