tz_datetime

A lightweight, cross-platform timezone-aware datetime package for Flutter and Dart applications.

This package serves as an alternative to the Timezone package with enhanced performance characteristics and improved resource efficiency.

Key Benefits

• App Size: No embedded IANA database in your app, keeping your application footprint small
• Memory Efficiency: IANA database is not loaded into memory, reducing RAM usage
• Fast Startup: Nothing to load before working with dates & timezones, improving app launch times
• Native Integration: Provides seamless calls to dedicated platform APIs
• Complete Data: No compromise on truncated databases - full timezone information available
• Minimal Dependencies: No heavy dependencies, only lightweight bindings to platform-specific implementations

API Compatibility

The API is designed to be very similar to the Timezone package, making migration straightforward.

Tests are adapted from the original package to ensure reliability and compatibility.

Usage

Basic usage example:

import 'package:tz_datetime/tz_datetime.dart';

void main() {
  final la = 'America/Los_Angeles';
  final ny = 'America/New_York';

  // Retrieve all available zones form platform
  final zones = TzDatetime.getAvailableTimezones();  // [Africa/Abidjan, Europe/Athens, ...]
  
  // Get offset from any date with Daylight Saving Times
  Duration offset = TzDatetime.getOffset(DateTime.now(), la);  // -8:00:00.000000

  final laTime = TzDatetime.now(la);  // 2026-02-09T03:17:03.964038-0800

  final nyTime = TzDatetime.from(laTime, ny);  // 2026-02-09T06:17:03.964038-0500
}

For more, see the API documentation.

Platform Support

On most platforms, the package leverages native system timezone databases for accuracy and efficiency.

On Windows, an embedded database approach is used to ensure consistent behavior.

Contributing

Contributions are always welcome!

License

This project is licensed under the BSD license.