Incorrect time displayed in fleet management platform; why?

Time displayed in the fleet management platform and actual time is different. Please help.

Activity time in fleet management platform is calculated based on 2 factors viz.,

1) Selected time zone for the fleet 

2) Time received from the device

Please follow below steps to learn how to set a fleet’s time zone

Step 1: Click “Setting” tab from top right corner of the screen (full screen mode)

Step 2: Click “Vehicles”

Step 3: Choose a vehicle from the list and click “Edit” button

Step 4: Choose the respective vehicle time zone and save the changes