It’s a known issue that will be addressed in a future version. Currently, there is no way to sync the timezones. The scheduler uses the server timezone (CST in your case), while the journal shows timestamps in the browser time zone (EST in your case). If all your EasyMorph users are in the Eastern timezone, I would suggest changing the Server time from CST to EST.
How big is the difference reported in the server message?
Additionally, I wanted to mention that the Web client compares the time reported by the server with the time provided by the web browser. To verify that your browser is providing the correct timezone, you can open the developer console by pressing Ctrl+Shift+J in Chrome/Firefox and entering new Date() into the prompt. This should display the current time which you can compare against your local time.
Unfortunately, currently there is no option to disable the message if the browser reports a time that is off. However, I can suggest exploring the workarounds outlined in the link I provided. These may help Chrome to ‘recognize’ the correct time zone and avoid the message altogether.