some locales crashes gnome-shell

[Muayyad AlSadi]

how can we debug this bug
https://bugzilla.redhat.com/show_bug.cgi?id=728889

I tried the following js in firebug/firefox

var d=new Date;
alert(Date.toLocaleFormat());
alert(Date.toLocaleFormat("%Y-%m-%d"));

we need to test

Shell.util_format_date(format, this.getTime());

I tried gjs and js command lines but I was unable to import Shell