AddMedicationScreen.kt

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun EndDateTextField(endDate: (Long) -> Unit) {
    Text(
        text = stringResource(id = R.string.end_date),
        style = MaterialTheme.typography.bodyLarge
    )

    val interactionSource = remember { MutableInteractionSource() }
    val isPressed: Boolean by interactionSource.collectIsPressedAsState()

    val currentDate = Date().toFormattedString()
    var selectedDate by rememberSaveable { mutableStateOf(currentDate) }

    val context = LocalContext.current

    val calendar = Calendar.getInstance()
    val year: Int = calendar.get(Calendar.YEAR)
    val month: Int = calendar.get(Calendar.MONTH)
    val day: Int = calendar.get(Calendar.DAY_OF_MONTH)
    calendar.time = Date()

    val datePickerDialog =
        DatePickerDialog(context, { _: DatePicker, year: Int, month: Int, dayOfMonth: Int ->
            val newDate = Calendar.getInstance()
            newDate.set(year, month, dayOfMonth)
            selectedDate = "${month.toMonthName()} $dayOfMonth, $year"
            endDate(newDate.timeInMillis)
        }, year, month, day)

    TextField(
        modifier = Modifier.fillMaxWidth(),
        readOnly = true,
        value = selectedDate,
        onValueChange = {},
        trailingIcon = { Icons.Default.DateRange },
        interactionSource = interactionSource
    )

    if (isPressed) {
        datePickerDialog.show()
    }
}

fun Int.toMonthName(): String {
    return DateFormatSymbols().months[this]
}

fun Date.toFormattedString(): String {
    val simpleDateFormat = SimpleDateFormat("LLLL dd, yyyy", Locale.getDefault())
    return simpleDateFormat.format(this)
}