Countdown.js is a little yet customizable countdown made in pure JavaScript.

• JSHint compliant
• Jasmine powered-tests
• ~2.2kb (~1kb once gzipped)
• No dependency

// Instanciating a new countdown with all defaults
new Countdown();

// Instanciating a custom countdown
var Countdown = new Countdown({
    selector: '#timer',
    msgBefore: "Will start at Christmas!",
    msgAfter: "Happy new year folks!",
    msgPattern: "{days} days, {hours} hours and {minutes} minutes before new year!",
    dateStart: new Date('2013/12/25 12:00'),
    dateEnd: new Date('Jan 1, 2014 12:00')
});

You can also play around with the code at CodePen.

You can pass the constructor number of options, including:

The selector you want to inject Countdown into. It should be a valid string for document.querySelector().

Default: .timer

The message to display before reaching dateStart.

Default: "Be ready!"

The message to display once reaching dateEnd.

Default: "It's over, sorry folks!"

The message to display during the countdown where values between braces get replaced by actual numeric values. Possible patterns:

• {years}
• {months}
• {weeks}
• {days}
• {hours}
• {minutes}
• {seconds}

Default: "{days} days, {hours} hours, {minutes} minutes and {seconds} seconds left."

The date to start the countdown to. Should be a valid instance of class Date. Documentation here at MDN.

Default: new Date() (now)

The date to end the countdown to. Should be a valid instance of class Date. Documentation here at MDN.

Default: new Date(new Date().getTime() + (24 * 60 * 60 * 1000)) (tomorrow)

The function to be called whenever the countdown starts.

Default: null

The function to be called whenever the countdown stops.

Default: null

Defines whether or not leading zeros are displayed when numbers are between 0 and 9.

Default: null

The script doesn't require jQuery at all meanwhile it fires two events on your element if you happen to have jQuery loaded: countdownStart and countdownEnd. You can use them this way:

new Countdown({
    selector: '.timer'
})

$('.timer').on('countdownStart', function() {
    // do something
});

grunt test (running JShint and Jasmine)
grunt deploy (running UglifyJS)