MediaWiki:Gadget-UTCLiveClock.js

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 // UTC Live Clock
 // Created by [[w:en:User:AzaToth]]
 //
 // Adds a clock in the personal toolbar that shows the current time in UTC, and provides a purge link.

function liveClock() {
	liveClock.node = mw.util.addPortletLink( 'p-personal', mw.util.getUrl(null, { action: 'purge' }), '', 'utcdate' );
	liveClock.node.style.fontSize = 'larger';
	liveClock.node.style.fontWeight = 'bolder';

	showTime();
}
$.when($.ready,mw.loader.using('mediawiki.util')).then(liveClock)

function showTime() {
	var dateNode = liveClock.node;
	if( !dateNode ) {
		return;
	}
    var now = new Date();
	var hh = now.getUTCHours();
	var mm = now.getUTCMinutes();
	var ss = now.getUTCSeconds();
	var time = ( hh < 10 ? '0' + hh : hh ) + ':' + ( mm < 10 ? '0' + mm : mm ) + ':' + ( ss < 10 ? '0' + ss : ss );
	dateNode.firstChild.replaceChild( document.createTextNode( time ), dateNode.firstChild.firstChild );

    setTimeout(showTime, 1000);
}