Not right day of week in datepicker

[jaropolk]

Instance of jquery-ui: ​https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/jquery-ui.js

OS: Ubuntu 12.04 (precise) 64-bit

browser: Chrome 21.0.1180.79

piece of code:

$(function() {
  $("#birthday").datepicker($.datepicker.regional["ru"]);
  $("#birthday").datepicker( "option", { 
    changeYear: true,
    changeMonth: true
  });
});

bug:

if you try to follow to april of 1984 so datepicker will show you that for instance april 22 of 1984 is a Saturday but actually it should be a Sunday. It's funny but in 1984 this error only for april! In april 1985 this bug don't happen but in april 1983 bug exist.

[mikesherov]

Thanks for taking the time to contribute to the jQuery UI project! I can no longer reproduce the issue using the latest jQuery and jQuery UI. ​http://jsfiddle.net/WqFyh/

If you can still reproduce it, please feel free to reopen the bug. Thanks!