In 2.5 the TPAM appliances uses UTC timezone, and you no longer apply an offset to the device itself.
The timezone offset is now applied at the user level. From /tpam | Users & Groups | User IDs | Manage UserDs | Details Tab for the user. There is a time tab half way down the screen where you can set the specific timezone the user is in.
When running reports, on the report filter tab you can select either "My Local Timezone" or "Server Timezone".
Note, it is important that the TPAM should be set to the correct time in UTC - and not the local time.