Introduction

Working with date picker and time picker widgets is fundamental for many Flutter apps—whether scheduling events, logging timestamps, or simply letting users select a date range. In this tutorial, you’ll learn how to integrate Flutter’s built-in pickers, handle asynchronous results, format user selections, and apply basic customizations. By the end, you’ll have a clean, reusable picker component you can drop into any form.

Setting Up Your Flutter Project

Before writing picker code, ensure you have:

• Flutter SDK (v2.0+) installed

• A new or existing Flutter app scaffolded (flutter create my_app)

• The intl package added for date formatting

Add intl to your pubspec.yaml:

dependencies:
  flutter:
    sdk: flutter
  intl

Run flutter pub get then import it where needed.

Implementing a Date Picker

Use Flutter’s showDatePicker function inside a stateful widget to let users pick dates. Here’s a minimal example:

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

class DatePickerExample extends StatefulWidget {
  @override
  _DatePickerExampleState createState() => _DatePickerExampleState();
}

class _DatePickerExampleState extends State<DatePickerExample> {
  DateTime? _selectedDate;

  Future<void> _pickDate() async {
    final now = DateTime.now();
    final picked = await showDatePicker(
      context: context,
      initialDate: _selectedDate ?? now,
      firstDate: DateTime(now.year - 5),
      lastDate: DateTime(now.year + 5),
    );
    if (picked != null) {
      setState(() => _selectedDate = picked);
    }
  }

  @override
  Widget build(BuildContext context) {
    final text = _selectedDate == null
        ? 'No date chosen'
        : DateFormat.yMMMMd().format(_selectedDate!);
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text('Selected date: $text'),
        ElevatedButton(
          onPressed: _pickDate,
          child: Text('Open Date Picker'),
        ),
      ],
    );
  }
}

Key points:

• initialDate, firstDate, lastDate define the selectable range.

• The result is Future<DateTime?>, so you await it.

• Format with DateFormat from intl.

Adding a Time Picker

Similarly, use Flutter’s showTimePicker to pick times:

Future<void> _pickTime() async {
  final picked = await showTimePicker(
    context: context,
    initialTime: TimeOfDay.now(),
  );
  if (picked != null) {
    setState(() => _selectedTime = picked);
  }
}

Integrate it in your widget:

• Declare TimeOfDay? _selectedTime;

• Display the value via _selectedTime?.format(context) ?? 'No time chosen'

• Trigger with a button labeled “Open Time Picker”

By separating date picker and time picker logic, you maintain modular code and can reuse each component independently.

Building a Combined DateTime Picker

To let users pick both date and time in sequence, chain the two pickers:

• Call _pickDate(), then if a date is chosen, call _pickTime().

• Combine into a DateTime object.

Example snippet inside your state class:

Future<void> _pickDateTime() async {
  final date = await showDatePicker(
    context: context,
    initialDate: DateTime.now(),
    firstDate: DateTime(2020),
    lastDate: DateTime(2030),
  );
  if (date == null) return;
  final time = await showTimePicker(
    context: context,
    initialTime: TimeOfDay(hour: 9, minute: 0),
  );
  if (time == null) return;
  setState(() {
    _selectedDateTime = DateTime(
      date.year, date.month, date.day, time.hour, time.minute);
  });
}

This approach delivers a simple datetime picker without external packages.

Customizing the Pickers

Out of the box, Flutter’s pickers inherit your app’s theme. You can override colors, shapes, and locale:

• Wrap showDatePicker in a Theme widget to supply a custom ThemeData for dialog.

• Pass locale parameter to localize month and weekday names.

• Use builder to wrap the dialog in additional styling:

await showDatePicker(
  context: context,
  initialDate: DateTime.now(),
  firstDate: DateTime(2000),
  lastDate: DateTime(2100),
  builder: (ctx, child) {
    return Theme(
      data: Theme.of(ctx).copyWith(
        colorScheme: ColorScheme.light(
          primary: Colors.deepPurple,
          onSurface: Colors.black,
        ),
      ),
      child: child!,
    );
  },
);

This snippet changes the primary color of the calendar header and selected date.

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Conclusion

You now know how to integrate date picker, time picker, and combined datetime picker widgets in Flutter. With this foundation, you can extend pickers further or integrate third-party datetime packages for advanced use cases. Happy coding!