Certain elements in the Unity dashboard run under a standardized time zone – mostly universal time coordinated (UTC). Other elements use a timestamp on your local time.
Here is the breakdown:
Campaign history and history and performance tools both use UTC.
When you hover over the creation/uploaded date for creative-packs and creative pages, you can see a timestamp marked as local time.
Once a campaign is live, The campaign's creation date is displayed on the campaign details page in relative time (i.e. five years ago). However, if a user modifies the start date of the campaign through the scheduling feature, then this new time will be displayed.
Scheduling uses UTC.