dhtmlx - config.xml_date - firefox issue

Hello,

Looks like something wrong with config.xml_date for mozilla firefox
I have prepared the example
docs.dhtmlx.com/gantt/snippet/32d3239d

it works fine in the chrome, but for mozilla firefox issue with year in the header on the right side.
Year is 2013, but should be 2014

Could you please help to fix it?

Which timezone and OS you are using ?
While checking from my side the same link works correctly.


Thanks for feedback

os is Windows 8.1, Windows 7

timezone is
(UTC+03:00) Moscow, St. Petersburg, Volgograd (RTZ 2)
Russian Standard Time

The issue was attached


I have changed local
tzutil /s “Central America Standard Time”

and now it works fine

But I whould like to use my local timezone

How avoid this issue?