Every account in Ptengine has a timezone.
But this can be done at the time of Signing up and while adding new profile(this is available for Paid Subscription).
2. At the time of adding a profile, go to the profile list and click +Add Profile
A pop-up will appear and you can set the timezone
Once you have created a profile and should you need to change the timezone then kindly send us a message from the in-app messenger or contact us at firstname.lastname@example.org