knezzz/ntp

pub package CodeFactor

NTP

Plugin that allows you to get precise time from Network Time Protocol (NTP). It implements whole NTP protocol in dart.

This is useful for time-based events since DateTime.now() returns the time of the device. Users sometimes change their internal clock and using DateTime.now() can give 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: time.google.com

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 'time.google.com'
• default port is 123

  DateTime startDate = new DateTime.now().toLocal();
  int offset = await NTP.getNtpOffset(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> getNtpOffset({
    String lookUpAddress: 'time.google.com',
    int port: 123,
    DateTime localTime,
    Duration timeout,
  });

  Future<DateTime> now();