How to change timezone after install

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Brief description of the problem

I failed to change the timezone during install and now I am off by 3 zones, is there a way to edit the timezone or do I need to reinstall?

Detailed step by step instructions to reproduce the problem

install rockstor without completely reading steps

Web-UI screenshot

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Error Traceback provided on the Web-UI

I was able to correct the Timezone on my system by using " timedatectl set-timezone America/New_York"