It must be the same timezone as provided in eazyBI import options page > Time zone section:
https://docs.eazybi.com/eazybi/data-import/data-from-jira#DatafromJira-Timedimension
And here you can find how to change the cell color:
https://docs.eazybi.com/eazybi/analyze-and-visualize/create-reports/conditional-cell-formatting
Martins / eazyBI