DatePickerDialog

@Composable
fun DatePickerDialog(
    onDismissRequest: () -> Unit,
    confirmButton: @Composable () -> Unit,
    modifier: Modifier = Modifier,
    dismissButton: (@Composable () -> Unit)? = null,
    shape: Shape = DatePickerDefaults.shape,
    tonalElevation: Dp = DatePickerDefaults.TonalElevation,
    colors: DatePickerColors = DatePickerDefaults.colors(),
    properties: DialogProperties = DialogProperties(usePlatformDefaultWidth = false),
    content: @Composable ColumnScope.() -> Unit
): Unit

import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.material3.DatePicker
import androidx.compose.material3.DatePickerDialog
import androidx.compose.material3.DatePickerState
import androidx.compose.material3.DisplayMode
import androidx.compose.material3.SnackbarHost
import androidx.compose.material3.SnackbarHostState
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.material3.rememberDatePickerState
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier

// Decoupled snackbar host state from scaffold state for demo purposes.
val snackState = remember { SnackbarHostState() }
val snackScope = rememberCoroutineScope()
SnackbarHost(hostState = snackState, Modifier)
val openDialog = remember { mutableStateOf(true) }
// TODO demo how to read the selected date from the state.
if (openDialog.value) {
    val datePickerState = rememberDatePickerState()
    val confirmEnabled = remember {
        derivedStateOf { datePickerState.selectedDateMillis != null }
    }
    DatePickerDialog(
        onDismissRequest = {
            // Dismiss the dialog when the user clicks outside the dialog or on the back
            // button. If you want to disable that functionality, simply use an empty
            // onDismissRequest.
            openDialog.value = false
        },
        confirmButton = {
            TextButton(
                onClick = {
                    openDialog.value = false
                    snackScope.launch {
                        snackState.showSnackbar(
                            "Selected date timestamp: ${datePickerState.selectedDateMillis}"
                        )
                    }
                },
                enabled = confirmEnabled.value,
            ) {
                Text("OK")
            }
        },
        dismissButton = {
            TextButton(onClick = { openDialog.value = false }) { Text("Cancel") }
        },
    ) {
        // The verticalScroll will allow scrolling to show the entire month in case there is not
        // enough horizontal space (for example, when in landscape mode).
        // Note that it's still currently recommended to use a DisplayMode.Input at the state in
        // those cases.
        DatePicker(
            state = datePickerState,
            modifier = Modifier.verticalScroll(rememberScrollState()),
        )
    }
}