$(function() {
// test if user is seeing their own user page.
// only the current uuser's edit count is available through mw.config
// but it's possible to get other users' data as well;
// see [[User:PleaseStand/userinfo.js]] and [[User:UBX/LiveEditCounter.js]] for example
if( mw.config.get('wgPageName').indexOf('User:' + mw.config.get('wgUserName')) == 0 ) {
// Get values
var edits = mw.config.get('wgUserEditCount');
var date = $('#edit-rate-regdate').text();
var now = new Date();
var reg = new Date( date );
// Make calculations
var diff = Math.abs(now.getTime() - reg.getTime());
var hours = Math.ceil(diff / (1000 * 60 * 60)); // http://stackoverflow.com/a/3224854/266309
var rate = Math.round((hours / edits) * 10) / 10; // http://stackoverflow.com/a/11832950/266309
// Show result
$('#edit-rate').text( rate );
}
});