pub package

ntp

Plugin that allows you to get precise time from Network Time Protocol (NTP). Whole NTP protocol is implemented in dart.

This is useful for time-based events since DateTime.now() returns time of the device. Users sometimes change their internal clock and using DateTime.now() can give really wrong result. You can just get clock offset NTP.getNtpTime and apply it manually to DateTime.now() object when needed (just add offset as milliseconds duration), or you can get already formatted DateTime object from NTP.now.

By default lookup address for NTP is: pool.ntp.org

For example on how to use look in github library repository example/ folder.

How it works

Using int offset from getNtpTime()

  • default localTime is DateTime.now()
  • default lookUpAddress is 'pool.ntp.org'
  • default port is 123
  DateTime startDate = new DateTime().now().toLocal();
  int offset = await NTP.getNtpTime(localTime: startDate);
  print('NTP DateTime offset align: ${startDate.add(new Duration(milliseconds: offset))}');

Using DateTime from now

  DateTime startDate = await NTP.now();
  print('NTP DateTime: ${startDate}');

NTP Functions

  Future<int> getNtpTime({
    String lookUpAddress: 'pool.ntp.org',
    int port: 123,
    DateTime localTime,
  });
  Future<DateTime> now();

Libraries

ntp

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
dart:convert
Encoders and decoders for converting between different data representations, including JSON and UTF-8. [...]
dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
File, socket, HTTP, and other I/O support for non-web applications. [...]
dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]