In Airwave version 7, the highchart time has changed to be in your local user machine timezone instead of the server timezone which is bad (at least from my point of view). Every Airwave Graph should be displayed in the same timezone which is the server timezone that the application owner choose to set but this is not the case today (it was in Airwave version6). To add to more confusion, the popup graph if you click on the right side small bar graph icon, those are displayed in the server timezone. :O
We have submited a feature request to give option to the application owner to change this behavior to be able to revert back to what it was in version 6 which is to display all graph back according to the server timezone regards of what the user's machine timezone. If anyone of you have similar requirement, kindly promote this feature request.
https://arubanetworkskb.secure.force.com/cp/ideas/viewIdea.apexp?id=08740000000LDoU