A Clock Zone placed into a presentation displays the correct time. But a javascript clock in an HTML5 page displayed in the same presentation displays the wrong time by 5 hours ahead. Try this: find any javascript or html5 clock on the web. View that page on any web browser on any computer. Add the same page to a BrightSign HTML5 object in a presentation and publish it to a BrightSign.
Here are a few I tried:
http://www.pageresource.com/jscript/jclock2.htm
http://randomibis.com/coolclock/
http://jsbin.com/hvishnu999/1
http://www.radoslavdimov.com/jquery-plugins/jquery-plugin-digiclock/
Is something wrong with the BrightSign's javascript engine?