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@Composable
fun DatePickerDocked() {
    var showDatePicker by remember { mutableStateOf(false) }
    val datePickerState = rememberDatePickerState()
    val selectedDate = datePickerState.selectedDateMillis?.let {
        convertMillisToDate(it)
    } ?: ""

    Box(
        modifier = Modifier.fillMaxWidth()
    ) {
        OutlinedTextField(
            value = selectedDate,
            onValueChange = { },
            label = { Text("DOB") },
            readOnly = true,
            trailingIcon = {
                IconButton(onClick = { showDatePicker = !showDatePicker }) {
                    Icon(
                        imageVector = Icons.Default.DateRange,
                        contentDescription = "Select date"
                    )
                }
            },
            modifier = Modifier
                .fillMaxWidth()
                .height(64.dp)
        )

        if (showDatePicker) {
            Popup(
                onDismissRequest = { showDatePicker = false },
                alignment = Alignment.TopStart
            ) {
                Box(
                    modifier = Modifier
                        .fillMaxWidth()
                        .offset(y = 64.dp)
                        .shadow(elevation = 4.dp)
                        .background(MaterialTheme.colorScheme.surface)
                        .padding(16.dp)
                ) {
                    DatePicker(
                        state = datePickerState,
                        showModeToggle = false
                    )
                }
            }
        }
    }
}

@Composable
fun DatePickerFieldToModal(modifier: Modifier = Modifier) {
    var selectedDate by remember { mutableStateOf<Long?>(null) }
    var showModal by remember { mutableStateOf(false) }

    OutlinedTextField(
        value = selectedDate?.let { convertMillisToDate(it) } ?: "",
        onValueChange = { },
        label = { Text("DOB") },
        placeholder = { Text("MM/DD/YYYY") },
        trailingIcon = {
            Icon(Icons.Default.DateRange, contentDescription = "Select date")
        },
        modifier = modifier
            .fillMaxWidth()
            .pointerInput(selectedDate) {
                awaitEachGesture {
                    // Modifier.clickable doesn't work for text fields, so we use Modifier.pointerInput
                    // in the Initial pass to observe events before the text field consumes them
                    // in the Main pass.
                    awaitFirstDown(pass = PointerEventPass.Initial)
                    val upEvent = waitForUpOrCancellation(pass = PointerEventPass.Initial)
                    if (upEvent != null) {
                        showModal = true
                    }
                }
            }
    )

    if (showModal) {
        DatePickerModal(
            onDateSelected = { selectedDate = it },
            onDismiss = { showModal = false }
        )
    }
}

fun convertMillisToDate(millis: Long): String {
    val formatter = SimpleDateFormat("MM/dd/yyyy", Locale.getDefault())
    return formatter.format(Date(millis))
}
DatePickers.kt

@Composable
fun DatePickerModal(
    onDateSelected: (Long?) -> Unit,
    onDismiss: () -> Unit
) {
    val datePickerState = rememberDatePickerState()

    DatePickerDialog(
        onDismissRequest = onDismiss,
        confirmButton = {
            TextButton(onClick = {
                onDateSelected(datePickerState.selectedDateMillis)
                onDismiss()
            }) {
                Text("OK")
            }
        },
        dismissButton = {
            TextButton(onClick = onDismiss) {
                Text("Cancel")
            }
        }
    ) {
        DatePicker(state = datePickerState)
    }
}
DatePickers.kt

@Composable
fun DatePickerModalInput(
    onDateSelected: (Long?) -> Unit,
    onDismiss: () -> Unit
) {
    val datePickerState = rememberDatePickerState(initialDisplayMode = DisplayMode.Input)

    DatePickerDialog(
        onDismissRequest = onDismiss,
        confirmButton = {
            TextButton(onClick = {
                onDateSelected(datePickerState.selectedDateMillis)
                onDismiss()
            }) {
                Text("OK")
            }
        },
        dismissButton = {
            TextButton(onClick = onDismiss) {
                Text("Cancel")
            }
        }
    ) {
        DatePicker(state = datePickerState)
    }
}
DatePickers.kt

@Composable
fun DateRangePickerModal(
    onDateRangeSelected: (Pair<Long?, Long?>) -> Unit,
    onDismiss: () -> Unit
) {
    val dateRangePickerState = rememberDateRangePickerState()

    DatePickerDialog(
        onDismissRequest = onDismiss,
        confirmButton = {
            TextButton(
                onClick = {
                    onDateRangeSelected(
                        Pair(
                            dateRangePickerState.selectedStartDateMillis,
                            dateRangePickerState.selectedEndDateMillis
                        )
                    )
                    onDismiss()
                }
            ) {
                Text("OK")
            }
        },
        dismissButton = {
            TextButton(onClick = onDismiss) {
                Text("Cancel")
            }
        }
    ) {
        DateRangePicker(
            state = dateRangePickerState,
            title = {
                Text(
                    text = "Select date range"
                )
            },
            showModeToggle = false,
            modifier = Modifier
                .fillMaxWidth()
                .height(500.dp)
                .padding(16.dp)
        )
    }
}
DatePickers.kt

// ...
    var selectedDate by remember { mutableStateOf<Long?>(null) }
// ...
        if (selectedDate != null) {
            val date = Date(selectedDate!!)
            val formattedDate = SimpleDateFormat("MMM dd, yyyy", Locale.getDefault()).format(date)
            Text("Selected date: $formattedDate")
        } else {
            Text("No date selected")
        }
// ...
        DatePickerModal(
            onDateSelected = {
                selectedDate = it
                showModal = false
            },
            onDismiss = { showModal = false }
        )
    }
// ...
DatePickers.kt