TimeKeeper

Plain javascript plugin to sync client time with server time

Example:

Basic usage:

var timekeeper = TimeKeeper({
  ajaxType: 'get',
  ajaxMilliUrl: '/utcMillis',
  responseParser: function (response) {
    return parseInt(response);
  },
});

timekeeper.sync(function () {
 console.log('Correct date:', timekeeper.Date());
});

NOTE: responseParser must return date in milliseconds

Sync at regular interval:

var timekeeper = TimeKeeper();

timekeeper.on('synced', function () {
 console.log('Synced successfully');
});

timekeeper.startSync(5 * 60 * 1000);  // Will sync regularly at 5 min interval

Or if you already know the current correct time:

var timekeeper = TimeKeeper({ correctTimeInMillis: 1467451864591 });
console.log('Correct time:', timekeeper.Date());

/**
 * Or you can use "setCorrectTimeInMillis" method
 */
var timekeeper = TimeKeeper();
timekeeper.setCorrectTimeInMillis(1467451864591);
console.log('Correct time:', timekeeper.Date());

You can also override native Date with correct Date:

var timekeeper = TimeKeeper({ overrideDate: true, correctTimeInMillis: 1467451864591 });
console.log('Correct time:', new Date());

Options

• correctTimeInMillis - Correct time (server time)
• ajaxType - HTTP Method type [get/post/put]
• ajaxMilliUrl - URL to hit to fetch time in UTC milliseconds (Default value: "/utcMillis")
• syncInterval - Interval at which sycn should happen
• responseParser - Parser method for response
• differenceInMillis - Incase you know difference of machine time and server time in milliseconds you can pass

Methods

• sync - Fetches server time
• Date - Gets Date object with server time (correct time)
• startSync(<intervalInMilliseonds>) - Starts to run sync operation at given regualar interval
• stopSync - Stops sync operation loop
• setCorrectTimeInMillis((<timeInMillis>)) - Sets correct time (server time)
• overrideDate - Overrides default Date object with server time Date object
• releaseDate - Undos overrideDate operation
• setDifferenceInMillis(<timeInMillis>) - Sets the server and client time difference
• getDifferenceInMillis - Gets the server and client time difference
• on(<eventName>, <eventHandlerMethod>) - Attaches events
• off - Removes events

Events

• Supported events
• sync - Will be triggered before syncing (prehook for sync)
• synced - Will be triggered when time sync is successful
• sync_error - Will be triggered when time sync fails
• first_sync - Will be triggered before syncing for the first time
• first_synced - Will be triggered when time sync for first time is successful
• first_sync_error - Will be triggered when time sync for first time fails

Motivation

Have you seen chat application showing "1 day ago" for a message which you received just now.
This is probably because the client machine time is set wrongly.
To avoid this chaos the client time should be in sync with server time.

To see demo

• Clone the project

git clone https://github.com/Sujsun/timekeeper.git

• Install npm dependencies

npm install 

• Run the server npm start or grunt

• Visit http://localhost:8989 or http://127.0.0.1:8989